According to Human Rights Watch: "The Saudi Arabia-led coalition fighting in Yemen carried out at least six apparently unlawful airstrikes in residential areas of the capital, Sanaa, in September and October 2015, killing 60 civilians. Coalition members and the United States, as a party to the conflict, are required under the laws of war to investigate such attacks, but they have not. Human Rights Watch found no evidence of any military target in an airstrike on the Old City and on al-Asbahi neighborhood in September. Airstrikes that caused civilian casualties on homes on Marib Street and in the neighborhoods of Hadda, al-Hassaba, and Thabwa hit 200 meters or more from possible military objectives. These attacks failed to distinguish civilians from military objectives or caused disproportionate civilian loss. Houthi forces in at least two of the attacks put civilians at unnecessary risk by deploying in densely populated neighborhoods.... One coalition attack struck a house in Sanaa’s Old City, a UNESCO World Heritage Site, on the night of September 13, killing 18 civilians and wounding many others. Abd al-Khalik Muhammad al-Khamisi, 29, told Human Rights Watch he was sleeping at home with his family in their second-floor apartment, 50 meters from where the strike hit: “I woke up to a loud noise, and felt the glass from all the windows in the room shatter on top of us. My wife and I asked each other why a bomb would drop here; there was no military target near here. It was so loud, so dark.” Al-Khamisi found his mother holding his 2-year-old son – covered in dust but unharmed." ^[+]