Documents identifying Islamic State militants leaked to Sky News

Tens of thousands of documents have been leaked, containing the names, addresses, telephone numbers and family contacts of Islamic State militants.

They were given to Sky News on a memory stick, stolen from the head of the terror group's internal police.

Former head of Britain's Counter Terrorism Security Office, Chris Phillips, says it's hugely significant: “I think probably in years to come we will look back upon this day as one of the key days in the battle against Daesh.

“The security service will just love this.

“This is absolutely vital information for all the different countries where these fighters will have come from.”