The Somali-born student who carried out a car-and-knife attack at Ohio State University complained on his Facebook account about U.S. interference in countries with Muslim communities, a law enforcement official told The Associated Press. Abdul Razak Ali Artan warned about Muslims he described as belonging to “a sleeper cell, waiting for a signal.” He said that if the U.S. wanted “Muslims to stop carrying lone wolf attacks, then make peace with ‘dawla in al sham,’” a term for the Islamic State group, according to the law enforcement official, who was briefed on the investigation but wasn't authorized to discuss it...