JEREMY Corbyn, the Labour leadership frontrunner, has questioned the point of the British military action in Syria that killed Isis militants Reyaad Khan from Cardiff and Ruhul Amin from Aberdeen.

The left-winger said he would not have authorised the drone attack that killed the Islamist extremists and insisted David Cameron had "some very difficult questions to answer about the legality of what he did".

Khan and Amin were killed in an unprecedented targeted air strike by an RAF drone on August 21 in the Isis stronghold of Raqqah.

Earlier this week, the Prime Minister said the attack was justified on the grounds of "self-defence" because Khan specifically was involved in orchestrating a number of plots to attack "high-profile public commemorations" over the summer.

Defence Secretary Michael Fallon has insisted the Government would "not hesitate" to take similar action against others on a reported "kill-list" of Isis extremists.

But Mr Corbyn, Chairman of the Stop the War Coalition, questioned the legal basis for the use of drones when details of the operation emerged and has now suggested there was no point in targeting the jihadi.

He told ITV News: "I'm unclear as to the point of killing the individual by this drone attack."

The potential election of Mr Corbyn as Opposition leader on Saturday could make it harder for the UK Government to obtain parliamentary approval for military action in Syria; although Tory Ministers have hinted they could still attract sufficient Labour support.

Asked about Mr Corbyn's comments, Mr Cameron's spokeswoman said: "The Prime Minister set out very clearly in the House that (Khan) posed a threat to Britain and the lives of British people. The Prime Minister is clear that it is important that people across the country understand the threat posed by Isil."