On 15 May 1948, as part of the 1948 Arab–Israeli War, Jordan intervened in Palestine together with many other Arab states. Following the war, Jordan controlled the West Bank and on 24 April 1950 Jordan formally annexed these territories after the Jericho conference. In response, some Arab countries demanded Jordan's expulsion from the Arab League. On 12 June 1950, the Arab League declared that the annexation was a temporary, practical measure and that Jordan was holding the territory as a "trustee" pending a future settlement. King Abdullah was assassinated at the Al-Aqsa Mosque in 1951 by a Palestinian militant, amid rumors he intended to sign a peace treaty with Israel.