The CCTV has been geolocated to Frank Road in Ely, Cardiff.
It has a time stamp showing 17:59 BST, 22 May 2023.
The location is 900m away from the site of the suspected crash.
This video, obtained by the news agency Wales News, comes after the South Wales Police and Crime Commissioner, Alun Michael, told the BBC that a chase did not take place.
Video content
Video caption: Cardiff riot: CCTV appears to show police following people minutes before crashCardiff riot: CCTV appears to show police following people minutes before crash
What do we know about Ely?
BBCCopyright: BBC
Ely is reeling after a riot broke out following a crash in which two teenage boys died.
The estate in Cardiff, which features mostly 1920s and 30s semi-detached houses, has a population of more than 14,600 people.
It's had a fair share of bad headlines over the years, but it also has a proud reputation as a close-knit working-class community.
Video caption: Cardiff: Cars burn on streets of Ely after riotsCardiff: Cars burn on streets of Ely after riots
Cars went up in flames and the road was littered with debris as riots took place in Ely on Monday night.
'No kids have gone to school today'
Stacey,
44, who lives locally says she watched the chaos after trying to find
her son who was visiting a friend on Snowden Road.
She says: "I was anxious, I was really, really
scared.
"It started with some of them starting a little fire in the
street and it just went from there.
"My boy hasn't gone to school today, and he's got exams
coming up. No one's kids have gone to school today, they've been up until 3am
with all of this.
"I remember the Ely riots in 1991 when I was 12, and it
brought back memories, absolutely."
UGCCopyright: UGC
Police still at the scene
Pictures from the past hour show that police are still on the ground in Ely after last night's disruption.
About a dozen officers were seen carrying bags along Stanway Road at about 14:20 BST.
BBCCopyright: BBC
BBCCopyright: BBC
BBCCopyright: BBC
BBC Verify
How the riot played out on social media
BBC Verify has confirmed the location of a number of posts on
social media from last night’s riot in Cardiff.
One of the first videos to emerge shows two police officers
rushing towards two people lying on the pavement in Snowden Road.
Shortly
afterwards, a Facebook live stream shows a crowd and a row of officers at a
nearby junction.
Images and videos later from the night show damaged and burnt
out vehicles.
.Copyright: .
Harvey 'loved motorbikes and football'
Bridy Bool, who says she knows the family of Harvey Evans, says the 15-year-old had eaten his tea and left his mum's house just before the crash.
She said: "He had been at home all day with his mum, and he went with his friend, and this happened."
She added: "Harvey was such a young boy, a sociable boy, he had loads of friends and he loved motorbikes and football.
"He was best friends with Kyrees and were into the same things. It was not unusual for them to be together."
More arrests expected, minister says
More arrests connected to the riots in Ely are expected, a Welsh government minister has said.
Speaking in the Senedd, minister for social justice Jane Hutt repeated calls for calm and said she was "shocked and saddened" to hear of the teenage boys' deaths.
She also called for people to "support the police and other agencies involved in supporting the local community".
Hutt thanked the community and the emergency services involved for "the exemplary way they pulled together to handle the situation".
Quote Message: I do understand that South Wales Police have made arrests in connection with the disorder, and that more will follow. But clearly this is something where our thoughts are also with the community, such a warm and strong community."
I do understand that South Wales Police have made arrests in connection with the disorder, and that more will follow. But clearly this is something where our thoughts are also with the community, such a warm and strong community."
Residents claim crash followed police chase - PA
The two teenage boys killed in a crash that sparked a riot in Cardiff on Monday evening were being chased by police, some residents have claimed to the PA news agency.
Kyrees Sullivan, 16, and 15-year-old Harvey Evans were killed in the Ely area of Cardiff while riding an electric bike.
South Wales Police have strongly denied the boys were being pursued by officers.
The force said the collision had already occurred when police arrived - and said officers remained on the scene to manage "large-scale disorder" until the early hours of this morning.
BreakingTeens killed in crash that sparked riots named
The two teenage boys who died in a crash
which sparked a riot in the Ely area of Cardiff have been named locally as 16-year-old Kyrees Sullivan and 15-year-old Harvey Evans, the BBC has been told.
Business owner offers to help with clean up
Daniel Pato, who runs a small gardening business, has offered a few hours to help with the clean up after the riot.
The owner of Greensleaves ground maintenance says: "If anybody needs help or is struggling to clear the mess created by last night's antics, I would be happy to help, free of charge.
"I have blowers, rubble sacks, shovels etc."
What happened where?
Two teenage boys died in a crash yesterday evening at 18:00 BST on Snowden Road in Ely, Cardiff.
Police arrived at the road later and a riot broke out on the street at about 20:00.
As the disorder continued into the early hours of the morning, those gathered moved down nearby Highmead Road as police attempted to disperse them.
BBCCopyright: BBC
Flowers left for teens killed in crash
PA MediaCopyright: PA Media
Flowers have been left as tribute for the two boys who died in a crash in Ely last night.
One tribute reads: "Friends are like stars, you don't have to see them to know they are there."
Police watchdog says it is not investigating
The police watchdog says it has not been asked to investigate the fatal crash or the riot in Ely.
"We have not received a referral from South Wales Police with regards to the incident in Ely last night and there is no indication yet that we will receive one," the Independent Office for Police Conduct says.
Police dismissed social media rumours that they were involved in the crash which, if true, would have meant the force would have to refer itself to the watchdog.
Police helicopters called in during riots
NPASSouthWestCopyright: NPASSouthWest
These images from the National Police Air Service (NPAS) show the view of Ely last night from a helicopter.
"Tonight
we helped South Wales Police and other assisting forces with a serious
incident and public disorder occurrence in Cardiff," says NPAS on Twitter.
"Our thoughts are very much
with everyone affected by this."
'When people have enough, this is what happens'
A resident who lives on Highmead Road in Ely says that people are "pretty anti-police" in the area and called it "a mad night".
Connor says he watched as rubbish and wheelie bins were set alight by rioters as they moved through the streets around his home.
"Although we've been afflicted by this riot, I still understand it. When people have enough, this is what happens," he says.
Rioting was appalling and unacceptable, says Downing Street
Downing Street has released a statement on last night's events.
The Prime Minister's official spokesman described the "reports of disorder, violence, arson and specifically attacks on police officers" as "appalling and completely unacceptable".
"We remain grateful to the emergency services and first responders for all their support to the community and restoring order."
Live Reporting
Edited by Emma Owen, Nathan Williams and Alys Davies
All times stated are UK
Get involved
Police statement due shortly
Police are due within the next few moments to give a statement to the media following the riots in Cardiff last night.
We'll bring you updates from the statement when we have them.
What has happened so far?
We've been following this story all day and have been keeping you updated with new information as we get it.
Here's what we know so far:
BBC Verify
BreakingCCTV appears to show police following moped moments before crash
BBC Verify has verified CCTV video appearing to show a police van following two people on either a moped or electric bike, apparently minutes before a crash in which two teenagers died.
The CCTV has been geolocated to Frank Road in Ely, Cardiff.
It has a time stamp showing 17:59 BST, 22 May 2023.
The location is 900m away from the site of the suspected crash.
This video, obtained by the news agency Wales News, comes after the South Wales Police and Crime Commissioner, Alun Michael, told the BBC that a chase did not take place.
Video content
What do we know about Ely?
Ely is reeling after a riot broke out following a crash in which two teenage boys died.
The estate in Cardiff, which features mostly 1920s and 30s semi-detached houses, has a population of more than 14,600 people.
It's had a fair share of bad headlines over the years, but it also has a proud reputation as a close-knit working-class community.
Community wraps lamp-post with tributes
Balloons and flowers are being left for the two boys, named locally as Kyrees Sullivan, 16, and Harvey Evans, 15, who died in a crash before the riots broke out in Ely.
A lamp-post has been covered in tributes, with some using a ladder to add to the display.
Watch: Cars burn on city streets after riots
Video content
Cars went up in flames and the road was littered with debris as riots took place in Ely on Monday night.
'No kids have gone to school today'
Stacey, 44, who lives locally says she watched the chaos after trying to find her son who was visiting a friend on Snowden Road.
She says: "I was anxious, I was really, really scared.
"It started with some of them starting a little fire in the street and it just went from there.
"My boy hasn't gone to school today, and he's got exams coming up. No one's kids have gone to school today, they've been up until 3am with all of this.
"I remember the Ely riots in 1991 when I was 12, and it brought back memories, absolutely."
Police still at the scene
Pictures from the past hour show that police are still on the ground in Ely after last night's disruption.
About a dozen officers were seen carrying bags along Stanway Road at about 14:20 BST.
BBC Verify
How the riot played out on social media
BBC Verify has confirmed the location of a number of posts on social media from last night’s riot in Cardiff.
One of the first videos to emerge shows two police officers rushing towards two people lying on the pavement in Snowden Road.
Shortly afterwards, a Facebook live stream shows a crowd and a row of officers at a nearby junction.
Images and videos later from the night show damaged and burnt out vehicles.
Harvey 'loved motorbikes and football'
Bridy Bool, who says she knows the family of Harvey Evans, says the 15-year-old had eaten his tea and left his mum's house just before the crash.
She said: "He had been at home all day with his mum, and he went with his friend, and this happened."
She added: "Harvey was such a young boy, a sociable boy, he had loads of friends and he loved motorbikes and football.
"He was best friends with Kyrees and were into the same things. It was not unusual for them to be together."
More arrests expected, minister says
More arrests connected to the riots in Ely are expected, a Welsh government minister has said.
Speaking in the Senedd, minister for social justice Jane Hutt repeated calls for calm and said she was "shocked and saddened" to hear of the teenage boys' deaths.
She also called for people to "support the police and other agencies involved in supporting the local community".
Hutt thanked the community and the emergency services involved for "the exemplary way they pulled together to handle the situation".
Residents claim crash followed police chase - PA
The two teenage boys killed in a crash that sparked a riot in Cardiff on Monday evening were being chased by police, some residents have claimed to the PA news agency.
Kyrees Sullivan, 16, and 15-year-old Harvey Evans were killed in the Ely area of Cardiff while riding an electric bike.
South Wales Police have strongly denied the boys were being pursued by officers.
The force said the collision had already occurred when police arrived - and said officers remained on the scene to manage "large-scale disorder" until the early hours of this morning.
BreakingTeens killed in crash that sparked riots named
The two teenage boys who died in a crash which sparked a riot in the Ely area of Cardiff have been named locally as 16-year-old Kyrees Sullivan and 15-year-old Harvey Evans, the BBC has been told.
Business owner offers to help with clean up
Daniel Pato, who runs a small gardening business, has offered a few hours to help with the clean up after the riot.
The owner of Greensleaves ground maintenance says: "If anybody needs help or is struggling to clear the mess created by last night's antics, I would be happy to help, free of charge.
"I have blowers, rubble sacks, shovels etc."
What happened where?
Two teenage boys died in a crash yesterday evening at 18:00 BST on Snowden Road in Ely, Cardiff.
Police arrived at the road later and a riot broke out on the street at about 20:00.
As the disorder continued into the early hours of the morning, those gathered moved down nearby Highmead Road as police attempted to disperse them.
Flowers left for teens killed in crash
Flowers have been left as tribute for the two boys who died in a crash in Ely last night.
One tribute reads: "Friends are like stars, you don't have to see them to know they are there."
Police watchdog says it is not investigating
The police watchdog says it has not been asked to investigate the fatal crash or the riot in Ely.
"We have not received a referral from South Wales Police with regards to the incident in Ely last night and there is no indication yet that we will receive one," the Independent Office for Police Conduct says.
Police dismissed social media rumours that they were involved in the crash which, if true, would have meant the force would have to refer itself to the watchdog.
Police helicopters called in during riots
These images from the National Police Air Service (NPAS) show the view of Ely last night from a helicopter.
"Tonight we helped South Wales Police and other assisting forces with a serious incident and public disorder occurrence in Cardiff," says NPAS on Twitter.
"Our thoughts are very much with everyone affected by this."
'When people have enough, this is what happens'
A resident who lives on Highmead Road in Ely says that people are "pretty anti-police" in the area and called it "a mad night".
Connor says he watched as rubbish and wheelie bins were set alight by rioters as they moved through the streets around his home.
"Although we've been afflicted by this riot, I still understand it. When people have enough, this is what happens," he says.
Rioting was appalling and unacceptable, says Downing Street
Downing Street has released a statement on last night's events.
The Prime Minister's official spokesman described the "reports of disorder, violence, arson and specifically attacks on police officers" as "appalling and completely unacceptable".
"We remain grateful to the emergency services and first responders for all their support to the community and restoring order."