Pakistan's apex anti-graft body, National Accountability Bureau has interrogated country's incarcerated former Prime Minister Imran Khan in jail in a multibillion rupee corruption case.

A National Accountability Bureau (NAB) team visited the 71-year-old Pakistan Tehreek-e-Insaf (PTI) party chief in the Adiala Jail on Sunday, a senior official of the anti-graft watchdog told the country's Dawn newspaper.