The Khan Shaykhun chemical attack, which occurred on 4 April 2017, was investigated in a September 2017 report. According to the report, the attack was carried out by the Syrian Air Force with a Sukhoi 22 aircraft. The report says the aircraft conducted four airstrikes at 6:45am. One bomb carried a nerve agent and impacted a road. According to the report, 83 people were killed in the attack, mostly women and children, and almost 300 were injured. The report said the use of sarin constituted war crimes by Syrian forces.