"The basic message is that the Muslim community wants to voice its opposition to what it views as the oppression of the war on terror," said Imran Wahid of Hizb ut-Tahrir, one of the groups behind the protest march.

He said Muslims were angered by so-called control orders imposed by the British authorities on terrorism suspects, and by the US detention of terrorism suspects without trial at Guantanamo Bay, Cuba.

There were no incidents as the protesters - led by a banner reading United Against the Oppression of War on Terror - made their way to Paddington Green police station in west London, where terrorism suspects are questioned.

"It is kind of symbolic because a lot of people are taken there and released without charge a couple of days later," Wahid said.

The march occurred five days before a general election in Britain which Prime Minister Tony Blair hopes will give his Labour Party a third straight term in office.