A group of around 100 anti-fascists mobbed five or six men who were arriving late to the protest draped in Union Jacks and wearing England football shirts.
Police filmed the anti-EDL protesters as they chanted "fascist scum off our streets" and "follow your leader, kill yourself like Adolf Hitler" before escorting the EDL supporters around Parliament Square.
As the two groups arrived towards Westminster Tube station, the anti-fascists began to run towards the men, forcing the police to set up a cordon to protect them
More top news
The twins cubs, which were born in June, have been named Bert and Ernie after characters from Sesame Street.
The two victims died from their injuries in hospital after the explosion in Hertfordshire.
Investigations are continuing into the cause of the crash in chigwell which killed both people on board.