Coast Guard vessels continue to search the waters of San Pablo Bay on Monday, April 28, 2014, in Richmond, Calif. A federal transportation safety official arrived Monday in Northern California to investigate a collision between two small planes that sent one crashing into the San Francisco Bay. The collision occurred Sunday near the Richmond-San Rafael Bridge and involved a single-engine Cessna 210 and a single-engine Hawker Sea Fury TMK 20. (AP Photo/Bay Area News Group, Laura A. Oda)