One person has been killed and another remains missing after an explosion at a steel factory in the US state of Pennsylvania
A major search and rescue operation was launched at the US Steel Clairton Coke Works plant earlier today
Ten workers were injured when a violent explosion tore through part of the plant
Officials say a search and rescue operation is still under way for one employee who is unaccounted for
People living within a mile of the plant have been told to keep windows and doors shut over air pollution fears
Watch: Timelapse shows smoke billowing from steel plant after explosion
We are ending our live coverage of the Pennsylvania steel plant explosion, which left one dead and injured 10 others.
We've got a full round-up of this morning's incident and will continue to monitor developments as the search continues for a missing worker.
Thank you for reading.
Drone footage captured earlier at the scene of the explosion shows extensive damage at sections of the US Steel plant in Clairton.
Emergency workers and vehicles can be seen blasting water at two locations inside the plant amid scattered debris.
Watch: Drone footage shows damage to steel plant after explosion
US Steel's Clairton Coke Works is located on the edge of Clairton, by the Monongahela River, roughly 15 miles (24km) from Pittsburgh.
The plant is an important part of Clairton's economy, employing almost 1,300 people.
As we've been reporting, at least one person has been killed and another is missing after an explosion at the site earlier today.
Prior to that press conference, the sister of a worker at the Clairton plant told local media she was searching for information about her brother's whereabouts.
Trisha Quinn said she had contacted the site and several local hospitals but could not get firm answers about his condition. She heard from one person, who was not an official, that he was taken out on a stretcher.
"They need communication with these families," she said.
"It's heart-breaking. He has three kids that are messaging me every two minutes and we need answers - we need them now, even if it's not what we want to hear."
If you're just joining us, local officials have been giving an update on the explosion at US Steel plant outside Pittsburgh. Here is what we learned:
Watch: Authorities encourage residents near steel plant to stay indoors
Allegheny County Executive Sara Innamorato advises residents within one mile (1.6km) of the plant to remain indoors "out of an abundance of caution", echoing similar advice issued by officials earlier.
She says they should close all doors and windows and "avoid activities that draw in outside air - such as exhaust fans".
Innamorato adds that the county's health department has not detected a rise in sulphur dioxide above federal standards.
A search and rescue is ongoing for a missing worker at the US Steel site in Pennsylvania.
Local officials say one person has died, 10 are injured, and that one person who was previously feared missing has been found.
US Steel tells the press conference the plant is now "stable" but that an investigation is ongoing.
We're expecting a live update from police on the Pennsylvania explosion in the coming minutes.
We'll bring you text updates or you can watch by clicking play at the top of this page.
The moment the explosion tore through the steel factory was captured on a webcam set up by group Breathe Project, an environmental group which monitors air pollution.
We know at least one person was killed and that a search and rescue operation is ongoing.
Image source, Breathe ProjectSteam could be seen rising from the sprawling plant's chimneys prior to the explosion
Image source, Breathe ProjectAt around 10:47 local time, a rapidly expanding black cloud could be seen ejecting from one of the site's facilities
Image source, Breathe ProjectGrey smoke could then be seen pouring from the same area in the hour or so that followed
There were multiple explosions earlier at the steel plant, Pennsylvania Governor Josh Shapiro says in a post on X.
He says injured employees have been taken to local hospitals and that search and rescue efforts at the site are ongoing.
"If you’re in the area, continue to follow the instructions of local authorities," he adds
Black smoke from the steel plant alerted Clairton resident Deanna Forkey to the explosion, she says.
"I saw the black smoke and at that point, I realised there was an explosion over there; it wasn't normal," Forkey tells reporters.
She says her daughter also called to tell her the explosion shook their house, which is minutes away from the steel plant.
"My prayers are with all: the family, the people that are impacted."
Local eyewitness says steel plant explosion ‘shook’ her house
We can bring you comments from Clairton Mayor Richard Lattanzi, who spoke to CBS News a short while ago outside the US Steel Clairton plant.
Lattanzi, a former steelworker himself at a different plant, says "the [plant] is such a big part of Clairton".
He continues: "For anyone that works... you need to go home healthy, and some people are not going to see the same husband or son or somebody that's working the mill.
"It's just a sad day for Clairton."
We've just heard from US Steel, which owns the Clairton Coke Works plant.
Its president and CEO David Burritt says: "We are working closely with relevant authorities to investigate the cause of the incident and will provide additional updates as they become available.
"Nearly 1,300 dedicated men and women work at the Clairton Plant each day, performing their jobs with the utmost safety.
"During times like this, US Steel employees come together to extend their love, prayers, and support to everyone affected.”
Image source, AFP via Getty ImagesUS Steel Clairton Coke Works plant
At least one person has died and several more have been injured after a major explosion at a steel factory in the US state of Pennsylvania. Details are still emerging - here's everything we know so far:
Images are beginning to emerge which show the scale of the damage at the US Steel Clairton Coke Works.
Firefighters can be seen on the scene battling flames as smoke rises from the plant.
Image source, Reuters
Image source, ReutersThe Allegheny County Health Department has told people who live close to the steel plant to keep their windows closed, with smoke billowing from the site after the explosion.
Local officials say: "Out of an abundance of caution, residents within one mile of the plant are advised to remain indoors, close all windows and doors, set HVAC systems to recirculate, and avoid activities that draw in outside air, such as using exhaust fans."
They say unsafe levels of air pollution have not been detected at this stage, and that further updates will be issued as more information becomes available.
Dozens of people have been injured in what authorities have described as a mass casualty incident.
At least 15 ambulances are at the scene, Allegheny County Emergency Services' Kasey Reigner told CBS News.
It is still not known what caused the explosion.
Pennsylvania Governor Josh Shapiro says he’s monitoring the situation at the steel plant and is in touch with emergency services.
He wrote on X: "The scene is still active, and folks nearby should follow the direction of local authorities.
"Please join Lori and me in praying for the Clairton community."
At least one person is confirmed to have been killed in an explosion at the US Steel Clairton Coke Works, a large plant south of Pittsburgh, Pennsylvania.
Confirming the incident, local police said: “Two people are currently believed to be unaccounted for, and multiple individuals have been treated for additional injuries.
“The status of those individuals is not known at this time.”
This is a developing situation and we will bring you more information as soon as we get it.