MOJAVE, Calif. — Two people were killed and four others injured Thursday by an explosion at a Mojave Desert airport that is home to pioneering civilian rocket programs, authorities said. Wreckage of equipment and vehicles could be seen in an overhead view of the site broadcast by a KCAL-TV news helicopter. A sign on a truck behind a bunker had the name Scaled. Scaled Composites is the Mojave-based builder of SpaceShipOne, the first private manned rocket to reach space. "Reports are two fatalities and at least four critical injuries," said Kern County fire Capt. Doug Johnston, who was not at...