The man who gave San Diego FBI agents a phony tip about a terrorist plot in Boston is behind bars Tuesday, 10News reported. Mexican police arrested Jose Beltran Quinones in Mexicali, Mexico, Monday. Beltrans claimed that he helped a group of Chinese nationals illegally cross into the United States from Mexico. According to his tip, they were intent on detonating a dirty bomb in Boston. Beltrans is now being questioned by U.S. and Mexican officials about his motives.