Pakistan's disgraced nuclear scientist Abdul Qadeer Khan, who underwent prostate surgery, was discharged from hospital Sunday and taken to an unknown location.
Khan, 70, was driven out from a rear exit as television teams waited vainly at the main gate of the Aga Khan Hospital where his cancerous prostate gland was removed, television channel Geo said.
Information Minister Mohammad Ali Durrani had indicated after visiting Khan soon after the surgery that he would be shifted to his sister's house in Karachi.
Khan was reported to be improving after the operation. Doctors who carried out the surgery wanted him to remain in Karachi for post-operation care.
His sister Razia Khan was among the few people in her family allowed to visit him in the hospital.
Khan became a hero in Pakistan for his role in developing nuclear weapons but was put under virtual house arrest in Islamabad in January 2004 after admitting he was involved in the proliferation of nuclear weapons technology.