The attack is likely to be launched by British-born Islamist terrorists travelling back from Syria, Paul Cruickshank, the terrorism analyst for an American news, has said.

He claimed that he has been told about the threat by a senior European counter-terrorism official. Cruickshank said, the source told him, "There's intelligence that has been obtained by European security agencies that ISIS in Syria and Iraq is aiming to hit the United Kingdom next.”

"The intelligence suggesting that British ISIS operatives in Syria and Iraq have been tasked to return to the United Kingdom to launch an attack against the UK. These concerns have been compounded by that vote yesterday in the British House of Commons authorising British airstrikes for the first time against ISIS in Syria," Cruickshank cited.
 
Cruickshank, who has reported extensively on Al Qaeda, ISIS and other Islamist extremist groups, added that it is 'not clear how imminent this threat is'.

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