Members of the emergency services work near Parsons Green underground tube station in west London. Photograph: (AFP)
29 people have been injured.
The Islamic State has claimed responsibility for the bomb attack on the London underground train that injured 29 people.
"The bombing on a metro in London was carried out by a detachment of the Islamic State" group, a statement published by its Amaq propaganda agency stated.
Prime Minister Theresa May raised the national terror threat to 'critical', indicating that another attack could happen.
On Friday morning, a home-made bomb partially exploded on a packed commuter train heading into London leaving several injured. The incident took place at 8:20 am(0720 GMT).
This incident was Britain's fifth terrorism-related incident of the year, said the police.
(With inputs from AFP)