Pakistan's jailed former Prime Minister Imran Khan repeatedly told his sister that he was being tortured in prison, she said on Friday, shortly after he was taken to a hospital for a medical examination and sent back to jail within hours.

It was unclear whether Imran Khan would be returned to prison after the examination or allowed to remain at the hospital for medical treatment.

Khan has been imprisoned since August 2023 and says the cases against him are politically motivated, an accusation the government denies.