Britain faces 'unprecedented' terror threat, warns MI6 chief

Britain faces an "unprecedented" terror threat that will not subside until the Syrian civil war ends, the head of foreign intelligence service MI6 said Thursday, according to AFP.

In a rare speech for an intelligence chief, Alex Younger said British authorities had foiled 12 terrorist plots since June 2013 and warned that the "murderously efficient" Islamic State (ISIS) group was still plotting attacks from Syria, despite recent military reverses.