Iran's President Mahmoud Ahmadinejad has replaced the country's key oil and industry ministers in a major Cabinet reshuffle. Oil Minister Kazem Vaziri Mahaneh and Industry Minister Ali Reza Tahmasebi have resigned and been replaced by caretaker ministers, the official IRNA news agency said late Sunday. State-run media gave no reason for the alleged dismissals and only carried statements from the President, who named the head of the state-owned National Iranian Oil Company (NIOC), Gholam Hossein Nozari, as oil caretaker minister, and a Tehran chain store manager, Ali Akbar Mehrabian, as industry caretaker minister.