Investigators seek clues in small jet crash that killed 1 in Texas, where bystanders rushed to help

Investigators combed through wreckage Wednesday for clues to why a business jet crashed on a Texas highway, killing one person on board after its pilots reported mechanical problems while requesting an emergency landing at a nearby airport.The fiery crash late Tuesday in Laredo near the Mexican border sent bystanders racing from their cars to help police rescue passengers and crew from the burning aircraft.Video from the frantic scene showed someone trying to smash the cockpit glass with a sledgehammer, while others used makeshift levers as they worked to open the plane's door. Local officials said a firefighter entered the smoke-filled jet to extract one person still inside after the rest had escaped.“While the loss of life is deeply regrettable, it is nothing short of a miracle that this tragedy did not become a mass fatality event,” Laredo Mayor Victor Treviño told a news conference Wednesday.The cause of the crash was not immediately known. The Federal Aviation Administration was i