Police stepped in to separate the protesters and members of the English Defence League amid threats of violence from both sides.
Radicals carrying placards proclaiming 'Islam will dominate the world' branded US leaders 'murderers' and warned vengeance attacks were 'guaranteed'.
The protest came shortly after the verdict into the 7/7 inquest was released by Lady Justice Heather Hallett.
She recorded that the 52 victims had been 'unlawfully' killed when four terrorists attacked three tubes and a bus in 2005.
Lady Justice Hallett made a string of recommendations to both MI5 to prevent further atrocities and to 999 workers to react more effectively to major events.
However the protesters outside the embassy claimed 'it is only a matter of time' before another attack and that the 'West is the enemy'.
The capital has seen heightened security in recent days over fears of a revenge attacks by Al-Qaeda members. Read More