Several hundred English Defence League (EDL) supporters gathered on the steps of St Mary's Catholic Cathedral in Newcastle to protest against the killing of a British soldier last week.
Some sang "I'm English til I die" and were honked by passing van drivers.
Chants of "Whose streets? Our streets" and "RIP Lee Rigby" rang out and one protester carried a flag bearing the name of the killed British soldier.
Police were present in large numbers watching the demonstration grow.
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At least three children and 18 others - including members of the local police force - were among those who died.
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He told Peston on Sunday: "The country is crying out for leadership from the Prime Minister. We want to know her vision."