Islamic State fighters returning to UK 'pose huge challenge'

Civilians stand outside their homes in west Mosul, 9 March, caught up in battles between Iraqi forces and Isis.Security officials in Britain are urgently preparing for hundreds of UK nationals who went to fight for Islamic State to return, following an expected defeat of the group in Iraq and Syria.The jihadi group’s strongholds in Mosul, Iraq, and Raqqa, northern Syria, are expected to fall by the summer.