Various ethnic and religious factions tried to gain political accomplishments during this period, often resulting in violent revolts and a brutal suppression by the Iraqi military, led by Bakr Sidqi. In 1933, thousands of Assyrians were killed in Simele massacre, in 1935–1936 a series of Shi'a uprisings were brutally suppressed in mid-Euphrates region of Iraq, and in parallel an anti-conscription Kurdish uprising in the north and a Yazidi revolt in Jabal Sinjar were crushed in 1935. Throughout the period political instability led to an exchange of numerous governments. Bakr Sidqi himself ascended to power in 1936, following a successful coup d'état against prime minister Yasin al-Hashimi but was later assassinated in 1937 during a visit to Mosul, followed by the death of King Ghazi in a car crash in 1939 suspected to have been planned by the British, causing a regency under Prince 'Abd al-Ilah over the 4 year old king Faisal II of Iraq lasting until 1953.