Mayor Adams says the man arrested was "in possession of several items that we believe will connect him to this incident".

Adams says this is the result of "good old fashioned police work". Adams adds that a McDonald's employee reported that he had seen the person of interest, helping the police find him.

The man being questioned by police in the killing of UnitedHealthcare CEO Brian Thompson has been identified as 26-year-old Luigi Mangione, police city commissioner of New York City, Jessica Tisch says.

Mangione was reportedly found with an ID that had his name on it, along with a fake ID. He was detained at a McDonald's on Monday morning in Altoona, Pennsylvania.

He has not been charged in connection with the shooting.

New York City Mayor Eric Adams is speaking now, standing next to the New York Police Department's chief of detectives and police commissioner.

"We have a strong person of interest in the shooting that shook our city last week," Adams says.

The BBC is watching to hear any updates regarding the fatal shooting of United Healthcare CEO Brian Thompson.

Stay with us for updates or click the link above to watch.

The person of interest being questioned in the killing of UnitedHealthcare CEO Brian Thompson was found with writings that appeared to be critical of the health insurance industry, the Associated Press (AP) news agency is reporting, citing a law enforcement source.

We've reported earlier that the man also had a gun that was thought to be similar to the one used in the killing, as well as a silencer and several fake IDs.

The law enforcement source told AP that police found the man after receiving a tip that he had been spotted at a McDonald's near Altoona, Pennsylvania.

Altoona is about 233 miles (375 kilometres) west of New York City, where the killing of Thompson took place.

If you're just joining us, here's a recap of what we know so far about the fatal shooting of healthcare insurance boss, Brian Thompson last week:

• The 50-year-old UnitedHealthcare CEO was killed in New York last Wednesday, outside the Hilton Hotel in Midtown Manhattan. His widow said he had been receiving threats related to medical "coverage"
• The suspect was captured multiple times on CCTV after the shooting as they made a getaway

• A backpack believed to belong to the suspect was found in New York's Central Park by police on Friday and has been sent for forensic testing. The suspect was seen on an e-bike in the park shortly after the incident
• The NYPD deployed specialist scuba divers to search the bottom of Central Park's lake at the weekend, while dogs combed the parks wooded areas in search for the gun used in the shooting. Police have not yet said they found anything
• A man is being questioned in Pennsylvania over the killing, according to US officials. It has not yet been confirmed if he is the suspected shooter

We're expecting to hear from New York City Mayor Eric Adams in about 15 minutes' time.

He will be joined by law enforcement officials.

Stick with us, we will bring you updates from the briefing as they happen.

The man being questioned by police as a person of interest in Brian Thompson's murder was reportedly picked up in a McDonald's in Altoona, Pennsylvania, according to reports by CNN and the New York Times.

A staffer at the fast-food chain reportedly thought the man looked similar to the NYPD's photos and called police.

Police in Atloona then responded to the call and detained the man.

The Federal Bureau of Investigation is offering $50,000 (£39,140) for information that leads to an arrest of those involved with the deadly shooting of Brian Thompson.

The New York Police department is also offering a $10,000 (£7,830) reward.

With the manhunt for the suspected killer of UnitedHealthcare CEO Brian Thompson ongoing, here's a quick recap of all the images we have showing a person of interest wanted in connection with the shooting.

Image source, NYPD Crimestoppers

Image source, Reuters

Image source, NYPD Crimestoppers

Image source, NYPD Crimestoppers

The person of interest stopped by police on Monday was found in Altoona, Pennsylvania. That's roughly 280 miles (450km) from the scene of the crime in New York City.

It has not been confirmed if the man being questioned today is the shooting suspect.

What we do know is the shooting suspect was last seen on Wednesday, taking a cab in Manhattan's Upper West Side towards the George Washington Bridge Bus Station near 178th Street and Broadway, according to Fox News.

Prior to the shooting, police believe the suspect arrived at New York City’s Port Authority bus terminal on a Greyhound bus that came from Atlanta, according to CNN.

Authorities are, however, unsure of when or where the suspect boarded the bus.

Here's a look at where Altoona is in relation to where the deadly shooting unfolded last week:

Image source, Getty Images

While reports are emerging of a person of interest being questioned over the killing of Brian Thompson on Wednesday, police in New York have been searching for the gun used in the shooting.

The manhunt in Thompson's murder has been ongoing since 4 December and the NYPD have been searching Central Park for any clues.

A team of divers were seen near the New York park's iconic Bethesda Fountain all weekend during their search for the weapon.

As reported by the BBC's US partner, CBS News, scuba teams have been searching the bottom of the lake in a grid-like pattern, while units with dogs comb the park's wooded areas

Police have said finding the weapon is critical because it can assist detectives in finding out where it was purchased - and who owned it.

A short while after the shooting, the suspect is seen riding an e-bike in Central Park.

On Friday, police discovered a backpack in the park which they believe was used by the suspect.

Image source, Getty Images

We have another short update from the BBC's US partner, CBS News.

The person being questioned in Pennsylvania had a fake New Jersey driving licence, a source told CBS.

Two sources familiar with the investigation also said the person was carrying multiple other fake IDs.

We already heard the person of interest was carrying a gun similar to the one used in the shooting of UnitedHealthcare CEO Brian Thompson.

A reminder that the person being questioned has not been confirmed as the suspect in the shooting.

Police believe they have found the grey backpack the suspect was carrying at the time of the attack on Wednesday, CBS News reports, citing an NYPD official.

The bag, found in Central Park on Saturday, has been sent for forensic testing and its content remains unknown, CBS, the BBC's US news partner, says.

Police had deployed drones to Central Park to search for the backpack earlier today.

An image released by police after the shooting showed the suspect wearing a grey backpack at the time of the attack. It is thought the suspect later discarded the backpack in the park.

We have more details now from CBS News, the BBC's US partner.

They have spoken to a source close to the investigation that said a person was taken into custody on an unrelated matter, but is now being questioned about the death of Thompson.

It is not confirmed if the person is the suspect.

The source said the person was carrying a firearm similar to the one used in the shooting of the UnitedHealthCare CEO.

The source also said the physical description matched that of the person of interest being sought by the NYPD.

US authorities are questioning a man about the fatal shooting of healthcare insurance boss Brian Thompson, 50, on Wednesday morning in New York City, officials tell a local affiliate of CBS News, the BBC's US broadcast partner.

Here's the background to what's happened:

• The masked gunman arrived, on foot, outside the Hilton hotel in Midtown Manhattan about 06:39 EST (11:39 GMT) on Wednesday
• About five minutes later, Thompson arrived and the gunman shot him twice - in the back and leg - using a silencer, before fleeing on foot
• Minutes later, CCTV footage later captured the gunman riding an e-bike through Central Park

• Police initially released images of a man wearing dark clothing taken from a Starbucks CCTV camera just minutes before the attack - they also searched a building in upper west Manhattan
• On Thursday police released two new photos showing a "person of interest", wearing dark clothing but no face mask
• Three shell casings found at the scene of the crime had the words "deny", "defend" and "depose" written meticulously on them with a marker pen, echoing the title of a book criticising the ways insurers avoid paying claims

Image source, Unitedhealth

Brian Thompson was the CEO of UnitedHealthcare, the largest private insurer in the US. He was gunned down in Manhattan last Wednesday morning.

Thompson first joined the company in 2004 as director of corporate development and rose through the ranks to become the head of the company in April 2021.

He earned $10.2m (£8m) working for the company last year, up from $9.8m in 2022 and $9.6m in 2021.

Thompson graduated from the University of Iowa in 1997 with a bachelor's degree in business administration and accounting.

Before joining UnitedHealthcare, Thompson worked at PwC.

The 50-year-old was married to Paulette Thompson, had two sons and lived in Maple Grove, a suburb of Minneapolis, Minnesota.

• Read more about Thompson's background, including allegations of insider trading

A man is being questioned about the fatal shooting of a healthcare insurance boss in New York last week, officials tell a local affiliate of CBS News, the BBC's US broadcast partner.

NYPD is on the way to question a person of interest in Altoona, Pennsylvania.

Stick with us, we will being you the latest updates shortly.