British Prime Minister David Cameron has confirmed that three Islamic State terrorists, including two jihadists from the country, were killed in an airstrike lauched by an RAF drone. Reports have emerged that the decision was motivated by the assasination threat to Queen Elizabeth by the Isis.

The mastermind behind the plot to assassinate the queen at an event to mark the 70th anniversary of VJ Day--Reyaad Khan, a British national from Cardiff, Wales--was neutralised, Cameron said on Monday highlighting that the move was "a new departure" for the country.

A second British jihadi--Ruhul Amin from Aberdeen, Scotland--and an unidentified terrorist were also killed in the targeted attack by the Royal Air Force. The United Kingdom, however, denied that it has a "kill list".

The UK targeted its own citizens in Syria in the anti-Isis operation for the first time when it was not at war, according to The Telegraph.

The Isis plot involved detonating a huge bomb intended to kill the queen and other members of the royal family. After weighing the terror threat, Britain meticuously planned the attack and targeted its jihadists while they were in a car together in Syria, the New York Post reported.

A FoxNews report noted that the Cameron government did not consult Parliament before carrying out the attack. The government, however, "legally justified" the operation as the Isis was plotting a terror attack against the UK.

A report in The Guardian further noted that since the "individuals in question" were planning an armed attack against the UK, it was a morally justified action to kill them first.

The edit piece noted that as per English law, one does not have to wait for the aggressor to shoot first and the same principle is also applicable in the international law.