Man describes being grazed by fireball after terrorists bomb London subway

Authorities in London are calling a rush hour explosion a terrorist attack and one man is describing what it felt like to be right beside the blast.

UK police said Friday the blast on the London Underground was caused by an improvised explosive device, or IED--one that is believed not to have detonated entirely.

Watch: Police Release CCTV Photos of Manchester Bomber on The Night Of Terror Attack

RELATED: Terrorist blast on London underground train

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Terrorist blast on London underground train
An injured woman reacts outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
LONDON, ENGLAND - SEPTEMBER 15: A police officer escorts an injured woman from the scene at Parsons Green Underground Station on September 15, 2017 in London, England. Several people have been injured after an explosion on a tube train in south-west London. The Police are treating the incident as terrorism. (Photo by Chris J Ratcliffe/Getty Images)
LONDON, ENGLAND - SEPTEMBER 15: A police officer escorts an injured woman from the scene at Parsons Green Underground Station on September 15, 2017 in London, England. Several people have been injured after an explosion on a tube train in south-west London. The Police are treating the incident and terrorism. (Photo by Chris J Ratcliffe/Getty Images)
Armed police officers walk through a carriage of a London underground tube train at Parsons Green station in London, Britain September 15, 2017. REUTERS/Hannah McKay
A woman reacts outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
A man sits and waits in a London underground tube train at Parsons Green station in London, Britain September 15, 2017. REUTERS/Hannah McKay
A woman reacts outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Police officers walk on the road near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
An injured woman is led away after an incident at Parsons Green underground station in London, Britain, September 15, 2017. REUTERS/Luke MacGregor
People react near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Police officers and sniffer dogs walk near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Police officers stand on the road near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Police officers escort members of the public out of their inner cordon as they work near Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station. Police and ambulance services said they were responding to an 'incident' at Parsons Green underground station in west London on Friday, following media reports of an explosion. A Metro.co.uk reporter at the scene was quoted by the paper as saying that a white container exploded on the train and passengers had suffered facial burns. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
A woman walks with her dog past police cordon near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Armed policemen stand outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Police officers escort members of the public out of their inner cordon as they work near Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station. Police and ambulance services said they were responding to an 'incident' at Parsons Green underground station in west London on Friday, following media reports of an explosion. A Metro.co.uk reporter at the scene was quoted by the paper as saying that a white container exploded on the train and passengers had suffered facial burns. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Members of the London Fire Brigade stand by cordon near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
People stand by an ambulance near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Police vehicles line the street near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Members of a bomb disposal squad stand in the street near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
People speak with a police officer outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Armed policemen stand by cordon near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
LONDON, ENGLAND - SEPTEMBER 15: The emergency services are seen near the police cordon at Parsons Green Underground Station on September 15, 2017 in London, England. Emergency services are investigating reports of an explosion at the West London tube station. (Photo by Chris J Ratcliffe/Getty Images)
An injured woman is led away after an incident at Parsons Green underground station in London, Britain, September 15, 2017. REUTERS/Luke MacGregor
Staff from a local Italian restaurant hands out pizza and water from a stall near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Deputy Chief Constable Adrian Hanstock of the British Transport Police makes a statement to the media after an incident at Parsons Green underground station in London, Britain, September 15, 2017. REUTERS/Luke MacGregor
LONDON, ENGLAND - SEPTEMBER 15: A forensic tent is seen next to the stopped tube train at Parsons Green Underground Station on September 15, 2017 in London, England. Several people have been injured after an explosion on a tube train in south-west London. The Police are treating the incident as terrorism. (Photo by Chris J Ratcliffe/Getty Images)
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But the explosion was enough to strike fear in commuters, including a witness who walked away with burns.

"I heard a large bang from the doors on the other side of the train. And this fire ball above my head singed all my hair, there were burn marks on the top of my head," the witness said. "Everyone just ran off the train. it was scary."

Police say the man was among around 20 people who suffered some sort of injury from the blast. None of the injuries were reportedly life-threatening.

The incident, however, is being treated as a terrorist attack, one that could have taken countless lives after it occurred at the height of London's morning rush hour.

"The investigation is being led by the Metropolitan Police counter-terrorism command and part of national counter-terrorism policing network. And there are many urgent inquiries ongoing now with hundreds of detectives involved looking at CCTV, forensic work and speaking to witnesses.

"This investigation is supported by our colleagues by MI5 and bringing their intelligence expertise to bear on the case," Mark Rowley, Assistant Commissioner for Specialist Operations of the Metropolitan Police Service, told reporters.

Police did not provide details on any suspects, but U.S. President Donald Trump painted them with his signature broad strokes.

"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," he tweeted. "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!"

Watch: New Video of London Terror Attack Shows Terrified Bar Patrons Hiding in Bathroom

A photo circulated on social media showed what is purported to have been the bomb, a charred white bucket inside a bag with wires and flames coming out of it.

Service was suspended on the subway line and residents were warned of a heightened police presence over the weekend.

Watch: At Least 1 Dead, Others Injured in What Police Call Another London Terror Attack

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