Security forces in Pakistan were seen pushing a protester off a 25ft-tall tower of shipping containers during a demonstration that saw nearly 1,000 people arrested.

Pakistani security forces pushed a protester off a 25-foot tall stack of shipping containers as they were accused of opening fire on supporters of Imran Khan at a huge demonstration in Islamabad.

Pakistan's security forces have been accused of pushing a man off a stack of cargo containers during Tuesday's protests in the capital Islamabad, where crowds demanded the release of former Prime Minister Imran Khan.

The crackdown brought a swift end to the protests that have gripped Islamabad, Pakistan’s capital, this week ever since thousands of people gathered in the city to demand the release of Imran Khan, the former prime minister. Mr. Khan has been in prison since last August on charges that his party claims are politically motivated.

Pakistani authorities arrested nearly 1,000 supporters of jailed former prime minister Imran Khan who stormed the capital this week to demand his release, the city's police chief said on Wednesday.

Pakistan police said Wednesday they had arrested nearly 1,000 protesters who marched on the capital demanding the release of jailed ex-prime minister Imran Khan, after crowds were evicted from the city centre in a sweeping security crackdown.