Rescue workers in Washington, D.C., have launched a massive search operation in the Potomac River after an American Airlines flight and a U.S. Army Black Hawk helicopter collided midair late Wednesday, with both aircraft crashing into the water. So far no survivors have been found; at least 30 bodies have been pulled from the river. American Airlines Flight 5342 had 60 passengers and four crew members on board and was en route to the D.C.-area Reagan National Airport from Wichita, Kansas. Several passengers were members of U.S. Figure Skating, who were heading home after a training camp. The Black Hawk helicopter had three soldiers on board conducting a training flight. An investigation is underway by the National Transportation Safety Board, aided by the Federal Aviation Administration.