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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. 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)
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.

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.