Police forensics officers works alongside an underground tube train at a platform at Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station. British police are treating an incident on a London Underground train on Friday as an act of terrorism, saying "a number of people" had been injured. Twenty-two people were injured after a bomb blast on a packed London Underground train on Friday, the National Health Service said in a statement. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
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Witness on train describes 'huge pandemonium'
Witness Sally Faulding describes what happened after an explosive device detonated on a train at Parson's Green station in London. She shares her story with CNN's Hala Gorani.
2:02 • Source: CNN
London tube terror attack 9 videos
Police forensics officers works alongside an underground tube train at a platform at Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station. British police are treating an incident on a London Underground train on Friday as an act of terrorism, saying "a number of people" had been injured. Twenty-two people were injured after a bomb blast on a packed London Underground train on Friday, the National Health Service said in a statement. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
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Witness on train describes 'huge pandemonium'
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LONDON, ENGLAND - SEPTEMBER 16: Police vans sit parked outside Portcullis House in Westminster on September 16, 2017 in London, England. An 18-year-old man has been arrested in Dover in connection with yesterday's terror attack on Parsons Green station in which 30 people were injured. The UK terror threat level has been raised to 'critical'. (Photo by Jack Taylor/Getty Images)
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Police: Second man arrested in London attack
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LONDON, ENGLAND - SEPTEMBER 16: Police and armed police patrol in Westminster Underground station on September 16, 2017 in London, England. An 18-year-old man has been arrested in Dover in connection with yesterday's terror attack on Parsons Green station in which 30 people were injured. The UK terror threat level has been raised to 'critical'. (Photo by Jack Taylor/Getty Images)
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Building evacuated in connection to train bomb
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Members of the emergency services 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. "We are aware of an incident at Parsons Green tube station. Officers are in attendance," London's Metropolitan Police said on Twitter. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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How Underground terror incident unfolded
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Police forensics officers works alongside an underground tube train at a platform at Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station. British police are treating an incident on a London Underground train on Friday as an act of terrorism, saying "a number of people" had been injured. "Terrorist incident declared at Parsons Green Underground Station," police said in a statement. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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London tube attack witness, Chris Wildish
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London witness: Flames rose to the ceiling
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London Metropolitan Police press conference on terror attack on Septemer 15, 2017
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London police: Investigation is ongoing
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Members of the emergency services work alongside an underground tube train at a platform at 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. "We are aware of an incident at Parsons Green tube station. Officers are in attendance," London's Metropolitan Police said on Twitter. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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Police: Tube incident declared terror event
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