An anti-war protester tried to make a citizen's arrest on former prime minister Tony Blair – just weeks after another man stormed the Leveson Inquiry to harangue him.

Mr Blair was about to make a speech at the University of Hong Kong when Briton Tom Grundy shouted about breaches of the Geneva convention and accused the ex-premier of misleading the British public.

The 29-year-old was stopped by security before he could make the arrest. Mr Blair told the audience: "Actually, I am used to it."

Mr Grundy said: "I waited till he'd been speaking a minute or so before I stood up and went towards him and said 'Mr Blair, under Hong Kong's Power 101 law – the law which allows for citizen's arrest here – I'll be arresting you for crimes against peace'."