Pakistani security forces have been accused of opening fire on supporters of Imran Khan who stormed Islamabad this week to demand his release.

The jailed former prime minister’s aides claimed an unspecified number of people died and hundreds were injured during chaotic scenes on Tuesday night in the heart of the capital.

In one video circulating online, a man is pushed off a pile of shipping containers by men in riot police uniform, falling 25ft to the ground.

Pakistan’s government disputes the demonstrators’ version of events, saying that 600 arrests were made when the protests were cleared, bringing the total of detained supporters of Mr Khan to nearly 1,000 this week.