WATCH: Over 100 arrested during protests near PM's residence after Southport tragedy
Protesters outside Downing Street threw flares and beer cans, resulting in more than 100 arrests.
The protest comes after violent riots interrupted a vigil in Southport for three girls that were killed in a knife attack in the town on Tuesday. Local police reported that some protesters were suspected supporters of the English Defence League.
Starmer has condemned the violence that followed the attack, calling it "thuggery".