US

US coalition investigating reports of deadly Mosul airstrike

  • Residents carry the body of a person killed during fights between Iraq security forces and Islamic State on the western side of Mosul, Iraq, Friday, March 24, 2017. Residents of the Iraqi city's neighborhood known as Mosul Jidideh at the scene say that scores of residents are believed to have been killed by airstrikes that hit a cluster of homes in the area earlier this month (AP Photo/Felipe Dana)

    Residents carry the body of a person killed during fights between Iraq security forces and Islamic State on the western side of Mosul, Iraq, Friday, March 24, 2017. Residents of the Iraqi city's neighborhood known as Mosul Jidideh at the scene say that scores of residents are believed to have been killed by airstrikes that hit a cluster of homes in the area earlier this month (AP Photo/Felipe Dana)  (The Associated Press)

  • Residents carry the body of several people killed during fights between Iraq security forces and Islamic State on the western side of Mosul, Iraq, Friday, March 24, 2017. Residents of the Iraqi city's neighborhood known as Mosul Jidideh at the scene say that scores of residents are believed to have been killed by airstrikes that hit a cluster of homes in the area earlier this month (AP Photo/Felipe Dana)

    Residents carry the body of several people killed during fights between Iraq security forces and Islamic State on the western side of Mosul, Iraq, Friday, March 24, 2017. Residents of the Iraqi city's neighborhood known as Mosul Jidideh at the scene say that scores of residents are believed to have been killed by airstrikes that hit a cluster of homes in the area earlier this month (AP Photo/Felipe Dana)  (The Associated Press)

  • A resident carries the bodies of six people killed during fights between Iraq security forces and Islamic State on the western side of Mosul, Iraq, Friday, March 24, 2017. Residents of the Iraqi city's neighborhood known as Mosul Jidideh at the scene say that scores of residents are believed to have been killed by airstrikes that hit a cluster of homes in the area earlier this month (AP Photo/Felipe Dana)

    A resident carries the bodies of six people killed during fights between Iraq security forces and Islamic State on the western side of Mosul, Iraq, Friday, March 24, 2017. Residents of the Iraqi city's neighborhood known as Mosul Jidideh at the scene say that scores of residents are believed to have been killed by airstrikes that hit a cluster of homes in the area earlier this month (AP Photo/Felipe Dana)  (The Associated Press)

The U.S.-led coalition fighting the Islamic State group says it is investigating reports of an airstrike in a western Mosul neighborhood that allegedly left more than 100 civilians dead.

Residents of the Iraqi city's neighborhood known as Mosul Jidideh told an Associated Press team at the scene that scores of residents are believed to have been killed by a pair of airstrikes that hit a cluster of homes in the area earlier this month.

The coalition says it has "opened a formal civilian casualty credibility assessment on this allegation," according to a statement given to the AP.

Faced with their toughest fight against IS yet, Iraqi and coalition forces have increasingly turned to airstrikes and artillery to clear and hold territory in western Mosul's densely populated neighborhoods.