A home-made bomb on a packed rush-hour commuter train in London engulfed a carriage in flames and injured 22 people on Friday in Britain's fifth major terrorism incident this year, but apparently failed to fully explode.

Passengers heading into the British capital fled in panic after the blast as the train was about to depart Parsons Green underground station in West London at 8.20am.

Some suffered burns and others were injured in a stampede to escape but health officials said none were thought to be in a serious condition.

Source: Khaleej Times