100 protesters burn American flag outside U.S. embassy in London during minute's silence for 9/11

One protester in Grosvenor Square said: 'You will always face suffering, you will always face humiliation, unless you withdraw your troops from Muslim lands.'

A small group of Muslims staged a counter-demonstration nearby, holding up placards reading 'Muslims Against Extremism' and 'If You Want Sharia, Move To Saudi'.

Abdul Sallam, 41, who was waving a sign that read 'Keep The Silence', travelled down to London from his home in Glasgow to show the strength of his feelings.

'Islam is all about peace, but what they want to do is hate other people.

Destructive: Protesters take pictures of the burning American flag during the demonstration

'Islam teaches you that when you see anything bad or evil, you should speak out against it.

'If the moderate Muslims all came out and spoke out, that would defeat them.

'I am proud to be British. I love my country. All these people are doing is breaking Britain apart.'

Earlier, a group of English Defence League protesters were ordered to move on to accommodate the anti-American demonstration.

The 60-strong group briefly scuffled with police as they were forced away from their original location to a different part of Grosvenor Square.

Twenty people were arrested for breach of the peace as the group was dispersed towards Oxford Street.

And at least four more arrests were made as police escorted the Muslim group back towards the Central London Mosque in Regents Park.