More than 400 former jihadi fighters back in Britain, say security sources

UK authorities are facing an increased terror threat from battle-hardened fighters returning from Mosul and other conflict zones in Iraq and Syria.Security sources have told Sky News more than 400 former fighters are now believed to be back in Britain.The authorities believe there is a growing risk the UK could suffer the kind of mass gun and bomb attacks seen in France and Belgium recently, as many returning fighters will have been trained in the use of weapons and the construction of improvise