London, September 29 (RHC)-- Britain's anti-war activists have called for a national demonstration against a parliamentary decision, which allows Britain to join U.S.-led airstrikes in Iraq. Thousands of protesters across the country are expected to join the mass demonstration next weekend to condemn the parliament's decision for the Royal Air Force to launch airstrikes against the ISIL Takfiri militants in the war-torn country.

The demonstration is backed by the Stop the War Coalition, the Muslim Association of Britain (MAB), and the Campaign for Nuclear Disarmament (CND).

Chris Nineham, one of the founding members of Stop the War Coalition, condemned British involvement in the conflict, saying more Western intervention would "only increase anger and hatred of the West." Meanwhile, Mohammed Kozbar, vice-president of MAB, called MPs' overwhelming support for the military action in Iraq "disappointing," saying the decision is "a mistake that we could pay heavily for."

"We want people from all communities to join us on Saturday to send a message to the Prime Minister [David Cameron] that the British people are against the war in Iraq and Syria," Kozbar added.

On Saturday, British warplanes were deployed on the first mission in Iraq together with military aircraft from the U.S.-led coalition. The United States has conducted dozens of airstrikes against ISIL targets in Iraq since mid-August.

The deployment of warplanes by Britain came after British lawmakers approved airstrikes on ISIL positions in Iraq last Friday.

The ISIL terrorists currently control parts of eastern Syria and Iraq's northern and western regions, where they have committed heinous crimes. The CIA estimates that the group may currently have up to 31,000 terrorists in the two countries.

Observers say the rise of the ISIL cult can be directly attributed to the policies of Western countries, including the UK, in the Middle East region as they have been supporting militant groups in their fight against the Syrian government.