During the months after the coup d'état, a new constitution was prepared, which took effect on 18 January 2014. After that, presidential and parliamentary elections have to be held in June 2014. On 24 March 2014, 529 Morsi's supporters were sentenced to death, while the trial of Morsi himself was still ongoing. Having delivered a final judgement, 492 sentences were commuted to life imprisonment with 37 death sentences being upheld. On 28 April, another mass trial took place with 683 Morsi supporters sentenced to death for killing 1 police officer. In 2015, Egypt participated in the Saudi Arabian-led intervention in Yemen.