Young British men and women fighting in Syria is a "huge problem" with an estimated 500 UK citizens joining radicals abroad, Jonathan Russell told Good Morning Britain.
Political liaison officer at the anti-extremism organisation Quilliam Foundation described British men and women going to Somalia or Syria to fight as "the new face of terrorism".
More top news
There will be gales across Scotland and northern England this morning, but these will gradually ease through the afternoon.
An unnamed 14-year-old boy was taken into custody following the attack, Anderson County Coroner Greg Shore said.
Scientists hope to capture stunning images and valuable data in the final moments before its impact.