Cricketer turned politician Imran Khan has said he was pulled off a New York-bound plane by US immigration officials and interrogated about his view on American drone strikes in his country.

Khan, leader of the Pakistan Movement for Justice party (PTI), has campaigned vociferously for an end to the controversial US campaign of missile strikes against suspected Taliban and Al-Qaeda militants in Pakistan's tribal areas.

He argues they are illegal and counterproductive and earlier this month he led thousands of supporters -- and a group of American peace activists -- on a march to the edge of the restive tribal districts to protest against drones.

Khan was headed to New York to attend a fund raiser organised by his party when he was stopped by US officials in Toronto on Friday, he said.

"I was taken off from plane and interrogated by US Immigration in Canada on my views on drones. My stance is known. Drone attacks must stop," he wrote on Twitter.

Khan led a two-day protest march earlier this month against US drone strike with some 15,000 of his supporters and dozens of Western peace activists to Tank, the last town before the semi-autonomous tribal belt.