Britain will feel the repercussions of Syria and the rise of Islamic extremism within its own borders for "many years" to come, a top counter-terrorism expert has said.
Cressida Dick, the Metropolitan Police's assistant commissioner and head of specialist operations, warned that Britain would feel long-term consequences of the conflict.
She told the BBC it represented a terrorist threat to the UK, and that young British Muslims who have travelled to the war-torn country to fight might commit violence when they return.
Ms Dick told BBC Radio 4's The World This Weekend: "I'm afraid I believe that we will be living with the consequences of Syria - from a terrorist point of view, let alone the world, geopolitical consequences - for many, many, many years to come."
Leaders of a Cardiff mosque, attended by 3 young men who are now fighting in Syria, say they had nothing to do with their radicalisation.
The Home Secretary has told ITV News that young women have left Britain to fight for the extremists group ISIS in Syria and Iraq.