0517 GMT June 26, 2022
The ban was announced by Interior Minister Rana Sanaullah hours after a policeman was shot and killed during a crackdown on Khan's supporters, according to a police statement and remarks by Information Minister Marriym Auragzeb at a news briefing, Reuters reported.
An official of Khan's party had shot and killed the policeman, the information minister said.
Pakistani police detained hundreds of his supporters, police sources said Tuesday.
Khan, who was ousted last month in a confidence vote, has been leading rallies across the country, blaming the United States for conspiring to topple his government.
Pakistan is in dire need of external financial support as foreign reserves have fallen below $10.5 billion, equivalent to less than two months of imports. Shehbaz Sharif, who replaced Khan last month, has yet to take bold steps towards putting the economy back on track.
Khan had urged his supporters to march on Islamabad on Wednesday, warning the government that he wouldn't leave the capital until the parliament was dissolved in order to hold a fresh election. He has vowed to rally tens of thousands of people.
"No one would be allowed to siege the capital and dictate his demands," the interior minister said, adding the Cabinet had approved the ban.
He said Khan and his aides had termed it a bloody march, which could not be allowed following a sit-in that Khan held in 2014 for over four months that paralysed the country. At the time, Khan had rallied thousands of people to protest alleged rigging of an election in 2013.
Khan challenged the government to try to stop his march.
"You try to stop us if you could," he told reporters, saying a peaceful protest was his right that could not be denied.