WASHINGTON — The United States and its allies conducted 31 airstrikes since early Wednesday targeting Islamic State militants in Syria and Iraq, the Combined Joint Task Force carrying out the operations said Thursday.

In Syria, nine airstrikes hit near Al Hasakah and near the border town of Kobani, the task force said in a statement. In Iraq, 22 airstrikes destroyed vehicles, buildings and excavators near Mosul, Fallujah and other towns, it said.