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.

Islamabad Police Inspector General Ali Nasir Rizvi confirmed that 954 individuals had been arrested between Sunday and Tuesday, as protesters came within 1.6 kilometers of their intended target. The government reported at least one police officer and four paramilitary personnel were killed during the clashes.

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.