An explosion on a London Underground train at a station in south-west London on Friday left several commuters injured and caused panic in the area, media reports said.
Transport for London (TfL) said the District Line was partially suspended because of a “security alert”, The Independent reported.
The city’s District Line has been affected at Parsons Green station and several people are believed to have been hurt as a result of a large white plastic bucket in a supermarket plastic bag exploding in one of the carriages.
We are aware of reports on social media RE #ParsonsGreen. We will release facts when we can – our info must be accurate
— Metropolitan Police (@metpoliceuk) 15 September 2017
Passengers were seen badly burned and covered in blood after what police described as a “terrorist incident” on a London Underground train.
Witnesses reported seeing passengers with facial burns and hair coming off at Parsons Green station and seeing a fire or hearing an explosion on the train.
Police said “a number of people” were injured as Prime Minister Theresa May’s office said she would be chairing an emergency cabinet meeting later on Friday.
Emergency services said they were called at around 8:20 am (0720 GMT).
Armed police and sniffer dogs were seen on the train and around the station, which is set in a leafy suburb of southwest London popular with well-off commuters and filled with chic cafes.
“Terrorist incident declared at Parsons Green Underground Station,” police said in a statement.
“It is too early to confirm the cause of the fire, which will be subject to the investigation that is now underway by the Met’s Counter Terrorism Command,” it said.
Twitter user @Rrigs, who posted pictures of a white bucket smouldering on the train, said, “Explosion on Parsons Green District Line train. Fireball flew down carriage and we just jumped out open door”.
Explosion on Parsons Green district line train. Fireball flew down carriage and we just jumped out open door. pic.twitter.com/pGbfotbfsJ
— Rigs (@RRigs) 15 September 2017
The bucket looked like the type used by builders and there appeared to be cables coming out of it.
The station was closed, as well as an entire section of the District Line where it is located and police urged people to stay away from the area.
The incident would be the fifth terror attack in six months in Britain since March, when a lone attacker mowed down pedestrians and stabbed a police officer outside the British parliament.
British Foreign Secretary Boris Johnson, a former London mayor, appealed for calm.
“Obviously, everybody should keep calm and go about their lives in a normal way, as normal as they possibly can,” he told Sky News.
Passengers described chaotic scenes at the station in a leafy and normally quiet part of west London.
“There was panic, lots of people shouting, screaming, lots of screaming,” Richard Aylmer-Hall, 52, a media technology consultant, told the Press Association.
“There was a woman on the platform who said she had seen a bag, a flash and a bang, so obviously something had gone off,” he said, adding that “some people got pushed over and trampled on.
“I saw two women being treated by ambulance crews,” he said.
Nicole Linnell, 29, who works for a fashion label, said: “We saw people running down the tracks. About 30 or 40 people.
“They were running down the tracks outside our train,” she told the Press Association.
“It was absolutely terrifying”.
Natasha Wills, assistant director of operations at London Ambulance Service said: “Our initial priority is to assess the level and nature of injuries”.