A 19-year-old dual US-Israeli citizen has been arrested by Israeli authorities on suspicion of standing behind most of a series of bomb threats to Jewish communities in the U.S. over the last six months. Police spokesman Micky Rosenfeld described the suspect as a hacker, Authorities in Israel worked with the FBI and other international law enforcement for the arrest. The Anti-Defamation League said those threats led to evacuations of the buildings, upset Jewish communities and raised fears of rising anti-Semitism.