Officials launched a dragnet for the terrorist who detonated a homemade bucket bomb on a packed London subway train during Friday morning rush hour, injuring at least 22 people.

Police quickly called the incident on the District Line train at Parsons Green station a "terrorist incident." It was the fifth terrorist attack in Britain this year. Police said they have not arrested anyone in connection to the bombing but hundreds of detectives were trying to hunt down the perpetrator or perpetrators.

In this image made from video, fire raises at a southwest London subway station in London Friday, Sept. 15, 2017. London's Metropolitan Police and ambulance services are confirming they are at the scene of "an incident" at the Parsons Green subway station in the southwest of the capital. The underground operator said services have been cut along the line. (@RRIGS via AP) Expand / Collapse

Police said the fire on a London subway train was caused by the detonation of an improvised explosive device. (AP)

The Metropolitan Police force said police "are making fast-time inquiries to establish who was responsible and are working closely with the security services."

Counterterrorism policing chief Mark Rowley said hundreds of detectives were scanning surveillance camera footage, carrying out forensic work and speaking to witnesses.

Scotland Yard said an improvised explosive device was used in the attack, and London's Metropolitan Police counter-terrorism unit was also investigating; however, police did not immediately provide any details on any suspects.

The ambulance service said at least one of the injuries was thought to be serious or life-threatening and most of the injuries were flash burns.

Emergency personnel attend to a person after an incident at Parsons Green underground station in London, Britain, September 15, 2017.  REUTERS/Yann Tessier - RC13970D6A00 Expand / Collapse

Emergency services help a person after a fire at Parsons Green underground station in London, Britain. (Reuters)

Passengers reported seeing people with burns to their faces and bodies after the "massive flash of flames" on the tube station.

Peter Crowley, a passenger, told the BBC: "I heard a large bang from the doors on the other side of the tube train and this fireball came towards my heard and singed off all my hair – I have got burn marks at the top of my head. Everyone just ran off the train, it was quite scary.”

"It was a really hot intense fireball above my head, I've just got red marks and burns to the top of my head. There were a lot of people a lot worse than me.”

Photos taken inside a District Line train showed a white plastic bucket inside a supermarket shopping bag with flames and what appear to be wires visible.

An injured woman is assisted by a police officer close to Parsons Green station in west London after an explosion on a packed London Underground train, Friday, Sept. 15, 2017. London's Metropolitan Police says a fire on the London subway has been declared a "terrorist incident." (Dominic Lipinski/PA via AP) Expand / Collapse

A woman was injured after an explosion on a packed London Underground train. (AP)

Explosive experts told the Daily Mail that they were investigating the bucket and said if it exploded properly it could have killed dozens of people. The BBC reported that the homemade device contained a timer.

Police advised people to avoid the area.

“Our city utterly condemns the hideous individuals who attempt to use terror to harm us and destroy our way of life,” London Mayor Sadiq Khan said in a statement. "As London has proven again and again, we will never be intimidated or defeated by terrorism."

"My thoughts are with those injured at Parsons Green and emergency services who are responding bravely to this terrorist incident," British Prime Minister Theresa May tweeted.

Police said it was "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."

An injured woman is led away after an incident at Parsons Green underground station in London, Britain, September 15, 2017.  REUTERS/Luke MacGregor - RC1F274B6C70 Expand / Collapse

A woman is escorted away after the fire at Parsons Green underground station in London. (Reuters)

The London Ambulance Service said it was called in at 8:20 a.m. local time and dispatched multiple resources to the scene, including a hazardous area response team.

“Our initial priority is to assess the level and nature of injuries,” a statement read.

President Trump tweeted about the attack, which he said was perpetrated by a "loser terrorist."

"Another attack in London by a loser terrorist.These are sick and demented people who were in the sights of Scotland Yard. Must be proactive!" Trump wrote. "Loser terrorists must be dealt with in a much tougher manner.The internet is their main recruitment tool which we must cut off & use better!"

London police have declined to comment on Trump's suggestion that it knew about the attacker.

Richard Aylmer-Hall, 53, who was on the train when the blast occurred, said he saw people injured after being trampled.

"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. “Some people got pushed over and trampled on, I saw two women being treated by ambulance crews.”

Hall said he didn't believe anyone was injured by the actual device.

"It was an absolutely packed, rush-hour District Line train from Wimbledon to Edgware Road. I saw crying women, there was lots of shouting and screaming, there was a bit of a crush on the stairs going down to the streets,” he told Sky News.

Emma Stevie, a passenger on the train during the fire, told the BBC she became mixed in a “human stampede.”

Forensic investigators search next to a London underground tube at Parsons Green station in London, Britain, September 15, 2017. REUTERS/Hannah McKay - RC18C6E3FD30 Expand / Collapse

Investigators search next to a train at Parsons Green station in London. (Reuters)

"I wedged myself in next to a railing, I put myself in the fetal position," she said.

"There was a pregnant woman underneath me, and I was trying really hard not to crush her.

"I saw a poor little boy with a smashed-in head and other injuries. It was horrible.

"The injuries from the stampede seemed the worst. I'm outside now, there are women crying and people sitting on the floor."

British Foreign Secretary Boris Johnson said people should "keep calm and go about their normal lives" following the incident, adding that it would be “wrong to speculate.”

The London Underground itself has been targeted several times in the past, notably in July 2005, when suicide bombers blew themselves up on three subway trains and a bus, killing 52 people and themselves. Four more bombers tried a similar attack two weeks later, but their devices failed to detonate fully.

Fox News' Allison Barrie and The Associated Press contributed to this report.

Original Article

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