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Hundreds of anti-war protesters have taken to the streets to oppose Britain’s bombing campaign in Syria.

Demonstrators calling for an immediate halt to air strikes in the war-ravaged country are marching through central London towards Downing Street.

They gathered in Portland Place outside the BBC headquarters, New Broadcasting House, before setting off at about midday.

Air strikes were launched after MPs voted 397 to 223 in favour of military intervention on December 2.

Stop the War march making its way down Regent Street pic.twitter.com/Y0E0dTphit — BBC London Travel (@BBCTravelAlert) December 12, 2015

The "Stop Bombing Syria" protest was organised by the Stop the War coalition, which said beforehand: “A fourth war in a Muslim country in the past 14 years will achieve the same results as the previous three – death, misery and destruction.

“The national demonstration on Saturday 12 December will call for an immediate stop to the bombing of Syria.”

One protester, Ursala Khan, 22, of Birmingham, said she was at the rally to show support for innocent Syrians who could be caught up in the strikes.

She said: "If I was in that situation - if I was in Syria - I would hope someone on the other side of the world would stand up for me."

Ms Khan said she does not believe assurances that no civilians will be impacted.

"There is always going to be collateral damage, people will always be killed," she said.

The protest closed streets as it weaved along Regent Street, past Piccadilly Circus and Trafalgar Square. The crowd chanted: "Stop bombing Syria, no more war" and "They say warfare, we say welfare".

Outside Downing Street, deputy leader of the Green Party Dr Shahrar Ali attacked Prime Minister David Cameron for his pledge to accept 20,000 Syrian refugees over five years.

He said there were more than 4.2 million in Syria: "What is the UK's commitment judged against that? 0.005 per cent."

He added: "Refugees are not welcome here, according to Cameron. Refugees are welcome here according to us."

Nahella Ashraf, chairman of the Greater Manchester Stop The War group, said more than 70 per cent of the British public was against air strikes and believed they were unlikely to stop Isis.

She said: "If anything, it's just going to create more anger towards the West.

"We've seen the history of Iraq, Afghanistan and what happened in Libya - we haven't made the world a safer place."

Additional reporting by the Press Association.