JAYVEE: Aid group says ISIS shooting Fallujah residents attempting to flee fighting.

A number of those fleeing civilians have been killed as they tried to cross the Euphrates River, the Norwegian Refugee Council said in a report late Sunday. The NRC, which works with refugees and internally displaced Iraqis, cited interviews with some of those who fled in its report late Sunday.

Iraqi forces, backed by U.S.-led coalition airstrikes, have been fighting to retake the ISIS-held city of Fallujah since late May but the advance stalled last week because of heavy resistance the militants have put up and because an estimated 50,000 civilians remain trapped inside the city.

The offensive to retake Mosul after two years of occupation was put on hold back in April, and now the effort in Fallujah appears to be stalling as well.