Parsons Green:

By The Newsroom

Published 16th Sep 2017, 17:26 BST

Updated 27th Sep 2017, 11:43 BST

Armed police close to Parsons Green station in west London after the explosion on a packed London Underground train. PA

Detectives investigating an explosion on a London Underground train which sent passengers and those in the vicinity fleeing in fear have made their first arrest.

Here is what we know about the incident so far:

London Underground