Bahraini Embassy roof protest in London
17 April 2012 Last updated at 04:00 BST
Two protesters have climbed on to the roof of the Bahraini Embassy in central London, days before Bahrain is due to host its most high-profile international event, the Formula One Grand Prix.
There have also been violent clashes between police and protesters on the outskirts of the Bahrain capital Manama this week.
Demonstrators are calling for the sporting event to be cancelled and have sprayed walls with anti-Formula 1 graffiti.
Zoe Conway reports.