LINDEN, Calif. (AP) — The search for more human remains in what appears to be a mass grave used by two men known as the "Speed Freak Killers" has been suspended because of rain.The break came Monday after four straight days of grisly discoveries at Northern California burial sites disclosed by death row inmate Wesley Shermantine.He drew maps leading to locations in Calaveras and San Joaquin counties after a bounty hunter offered him money for the information.Over the weekend, searchers dug into an old well near the town of Linden that Shermantine claims could hold 10 or more victims from a killing spree during the 1980s and 1990s.More than 300 bone fragments have been found.