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Britain is ready to launch more drone strikes in Syria to thwart potential terrorism plots, Defense Secretary Michael Fallon vowed Tuesday, adding fuel to the debate over the extent of British operations in the Middle East.

His remarks followed Prime Minister David Cameron鈥檚 announcement Monday that more than two weeks earlier, Britain had conducted a drone strike for the first time inside Syria. The strike killed three suspected members of the so-called Islamic State, including two British citizens.

鈥淲e wouldn鈥檛 hesitate to do it again if we know there鈥檚 an armed attack likely,鈥� Secretary Fallon told BBC Radio. 鈥淚f there is no other way of preventing an armed attack that鈥檚 likely to take place on our streets other than using a military strike, then that鈥檚 what we will do.鈥�

The drone strike near the Syrian city of Raqqa on Aug. 21 marked the first time Britain had targeted a UK citizen in such a way outside a formal conflict, The Guardian reported.

Reyaad Khan, a 21-year-old from Cardiff who had appeared in an IS recruitment video last year, was the primary target. He was killed alongside Ruhul Amin, a 26-year-old from Aberdeen, and a third, unidentified associate.

Addressing the House of Commons, Cameron said Monday he had not sought Parliament鈥檚 approval for the strike because it was ordered in 鈥渟elf-defense.鈥� He said Mr. Khan represented a 鈥渃lear and present danger.鈥� He accused him of planning attacks on "high-profile public commemorations" in Britain, though he was vague about the exact threat posed.

Fallon said there was "no other way" of stopping Khan. But he declined to provide more details on what evidence they had found of plots against Britain.

The strike appears to bring Britain closer in line with the United States鈥� controversial drone policy and widens Britain鈥檚 involvement in the Middle East. Two years ago, UK lawmakers rejected a proposal for military action in Syria while signing onto the American-led campaign against IS targets in Iraq. But as The Guardian reports:

Opposition leaders and human rights groups have widely condemned the government for authorizing the drone strike without providing more evidence as justification. Interim Labor leader Harriet Harman has called for an independent review of the decision.

"The fact that David Cameron has bypassed Parliament to commit these covert strikes is deeply worrying 鈥� as is his refusal to share what legal advice he was given," Kat Craig, a legal director at rights group Reprieve, told Reuters.

News of the drone strike broke as France announced that it will start sending reconnaissance flights over Syria and is considering airstrikes against IS, reports The Associated Press.