EDL leader Tommy Robinson told the demonstration: "This is a day of respect for our Armed Forces."
The crowd repeatedly chanted "coward" after he claimed Prime Minister David Cameron was on holiday "because he doesn't care".
Mr Robinson added: "They've had their Arab Spring. This is time for the English Spring."
More top news
The 16-year-old girl who killed seven-year-old Katie Rough has been given a life sentence for manslaughter at Leeds Crown Court.
Islamic State terrorists are believed to be behind the bombing and shooting which injured a further 120 people during Friday prayers.
A commuter is on track to get married after using the information screen at Waterloo station to pop the question.