They promised a series of protests against Google HQ for the "hateful and offensive" video, saying they now live in an "age of mockery", The Telegraph reported.
Thousands had travelled from as far afield as Glasgow to take part in the demonstration, ahead of a planned million-strong march in Hyde Park in coming weeks.
Anger over "The Innocence of Muslims", an American-produced film which insults the Prophet Mohammad and demeans Muslims, according to protesters, remains available to watch on the website YouTube, a subsidiary of Google.
"Our next protest will be at the offices of Google and YouTube across the world," the daily quoted organiser Masoud Alam as saying.
"We are looking to ban this film. Speeches by more than a dozen imams in a mixture of Arabic, Urdu, and English urged Muslims to honour the name of the Prophet and not to back down in the face of Google's continuing reluctance to act," he said.
London: Some 10,000 Muslims Monday gathered outside the offices of Google in London to force the company to remove an anti-Islamic video from YouTube in Britain.
First Published: Tuesday, October 16, 2012, 12:07