Here's what we know so far about the London Underground bomb explosion

An explosion on a London Underground train which sent passengers and those in the vicinity fleeing in fear is being treated as a terrorist incident by police.
By The Newsroom
Published 15th Sep 2017, 14:02 BST
Updated 27th Sep 2017, 11:42 BST
Armed police attend the scene in London this morning after a bomb exploded on the London Underground.Armed police attend the scene in London this morning after a bomb exploded on the London Underground.
Armed police attend the scene in London this morning after a bomb exploded on the London Underground.

Here is what we know so far: