A number of radical Islamic groups including Muslims Against Crusades (MAC) gathered outside the embassy on the 10th anniversary of the attacks.
The group of around 100 men shouted "USA terrorists", brandished anti-American placards and chanted through a loudhailer.
Several members of the Muslim groups made anti-American speeches following the flag burning.
One said: "You will always face suffering, you will always face humiliation, unless you withdraw your troops from Muslim lands."
Another declared that America had been "defeated in Iraq and defeated in Afghanistan".
Members of the group publicly burned a poppy on Armistice Day in a similar stunt.
However, a small opposing group of Muslims - some of whom had travelled hundreds of miles to rebut the extremists - staged a counter-demonstration nearby, holding up placards reading "Muslims Against Extremism" and "If You Want Sharia, Move To Saudi". » | Andy Bloxham | Sunday, September 11, 2011
