The United States and its allies conducted 15 strikes against ISIS in Iraq and Syria Sunday, the coalition leading the operations said in a statement Monday. In Iraq, a dozen strikes near four cities hit several ISIS tactical units, vehicles, weapons caches, fighting positions and other targets, the Combined Joint Task Force said. Six strikes hit near Mosul, the ISIS stronghold in northern Iraq, and four near Ramadi, where the Iraqi military Sunday asked civilians to leave the city before a planned offensive. The remaining two strikes in Iraq were near Bayji, the military said. In Syria, three airstrikes near Mar'a and Ayn Isa hit one tactical unit, among other targets, according to the statement. The coalition also reported a strike near the ISIS stronghold of Raqqa Saturday, Dec. 19, that hit five ISIS gas and oil separation points and two crude oil collection points. The strikes used attack, fighter, bomber, ground-attack, and remotely piloted aircraft against militant targets, the statement said.