on Police have issued an arrest warrant for John Allen Mohammad, 42; charge is firearms violation. Meanwhile, the FBI is searching for a 1990 Chevy Caprice with N.J. plates. news_sniper_bus_1022_abc.jpg home New Sniper Leads black webpage.gif http://start.real.com/rd?url=http://smilparse.real.com/showcase/1pubs/channels/cnn/cnn.smi&adcode=none 10351291652750 CNN lock_icon.gif webpage.gif http://start.real.com/rd?url=http://smilparse.real.com/showcase/1pubs/channels/abc/abc.smi&adcode=none 10351291652751 ABCNEWS lock_icon.gif lock_icon.gif big_headline