ATLANTA — The FBI was investigating Wednesday after a “Molotov cocktail-style device” was thrown at a U.S. Immigration and Customs Enforcement building in downtown Atlanta the night before. The device, which was thrown around 8:15 p.m. Tuesday, caused minor damage, the FBI said in a statement. The investigation was ongoing and agents were “reviewing evidence and following leads.” No arrests had been made. The building also houses an immigration court. The Associated Press