Tensions continued between Jordan and Israel through the early 1950s, with Palestinian guerrillas and Israeli commandos crossing the Green Line. Abdullah I of Jordan, who had become Emir of Transjordan in 1921 and King in 1923, was assassinated in 1951 during a visit to the Al-Aqsa Mosque on the Temple Mount in East Jerusalem by a Palestinian gunman following rumours that he was discussing a peace treaty with Israel. The trial found that this assassination had been planned by Colonel Abdullah el-Tell, ex-military governor of Jerusalem, and Musa Abdullah Husseini. He was succeeded by his grandson King Hussein of Jordan once he came of age in 1953, after his father Talal's brief reign.