Pakistani cricketer-turned-politician Imran Khan says he has been stopped by US immigration officials and questioned about his views on US drone strikes in his country.
He says he was taken off his flight from Toronto to New York on Friday.
As leader of the Pakistan Movement for Justice party (PTI), he has campaigned for an end to drone strikes against suspected militants in Pakistan.
He says the strikes kill many civilians and foster support for militants.
“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.