In 1937, Iraq Petroleum Company (IPC), 23.75% owned by BP,[198] signed an oil concession agreement with the Sultan of Muscat. In 1952, IPC offered financial support to raise an armed force that would assist the Sultan in occupying the interior region of Oman, an area that geologists believed to be rich in oil. This led to the 1954 outbreak of Jebel Akhdar War in Oman that lasted for more than 5 years.[199]