Federal officials on Friday issued a bulletin to local law enforcement that ISIS supporters may attack holiday events in the U.S. over the weekend. The notice, from both the Federal Bureau of Investigation and the Department of Homeland Security, was reportedly sent as a cautionary measure after Islamic State sympathizers published a list online of American churches that one could attack. The agency's warning said, however, that were were no specific or credible threats of which to speak. "The FBI is aware of the recent link published online that urges attacks against U.S. churches," the agency said in a statement. "As with similar threats, the FBI is tracking this matter while we investigate its credibility."