A Saudi Arabian student at the University of New Mexico was arrested Friday by federal authorities on accusations of illegal possession of a firearm as a student visa holder. Authorities say a search of his Albuquerque residence turned up a handgun. Court records show engineering student Hassan Alqahtani appeared before a federal judge Friday and remained in federal custody afterward. The FBI says it received a tip in August at its National Threat Operations Center that Alqahtani possessed a firearm and was creating a list of people he wanted to kill that included professors at his university. A defense attorney disputed that a seized gun belonged to Alqahtani.