MSNBC reports, "A potential rocket engine problem may be to blame for the unexpected abort of a private SpaceX rocket launch before dawn on Saturday, officials said. SpaceX was slated to blast off its unmanned Dragon capsule and Falcon 9 rocket at 4:55 a.m. ET from here at the Cape Canaveral Air Force Station. Just after igniting its main engines, the computer onboard the booster initiated an automatic abort due to a high pressure reading in one of the rocket's nine main engines.
Dragon was due to fly to the International Space Station to become the first non-governmental vehicle to berth there. The spacecraft's next chance to launch is Tuesday at 3:44 a.m. ET, followed by a potential opportunity Wednesday at 3:22 a.m. ET.