SpaceX turned to fast-igniting fuel for its capsule escape system. That could be part of the accident probe
(LA Times Anaheim Ducks)

During the Apollo era, NASA astronauts relied on a rocket tower at the top of the capsule to pull them safely away in case of an emergency. If it wasn´t used, the tower was jettisoned after the Saturn V rocket had reached about 295,000 feet. But when SpaceX and Boeing Co. set out to build a new...