A home-made bomb exploded on a packed rush-hour commuter train in London injuring 22 people on Friday, police said, in what was being treated as the fifth terrorism attack in Britain this year.
When and where?
Passengers on board a train heading into the capital fled as fire engulfed a carriage at Parsons Green underground station in West London after the explosion at 8:20 a.m. local time (0720 GMT).
Some suffered burns while others were injured in a stampede to escape. The National Health Service said 22 people had been taken to London hospitals. None were thought to be in a serious condition, the ambulance service said.
Britain's top counter-terrorism officer Mark Rowley told reporters that most of the injuries were thought to be flash burns.
Rowley declined to answer whether the authorities knew who was responsible or if the suspected bomber had been on the train, saying it was a live investigation which was being assisted by the intelligence services.