Authorities say a seventh-grader is facing criminal charges for threatening to kill a Muslim schoolmate he labeled a "son of ISIS." School officials in the Vandalia-Butler district in suburban Dayton said the seventh-grader also may face expulsion for threatening the sixth-grade Muslim boy last week. They declined to release the suspect's name. An expulsion hearing will be held later. According to the district, another student at Morton Middle School overheard a threat of physical harm and reported it. A police report says the seventh-grader called the other child a terrorist and "son of ISIS" because he is Muslim. ISIS is the Islamic State terrorist group. The report said the seventh-grader wrote an apology letter to the younger boy.