ABC News Report: Astronaut Kopra breaks hip

HOUSTON More details about his injury, which was caused in a bicycle accident, are expected to come on Tuesday.

Kopra, who was the first member of the International Space Station to Tweet in space, was scheduled as the lead spacewalker for next month's shuttle Discovery launch, but his injury could delay the final mission for Discovery. That was scheduled for February 24.

The latest news about his injury is the latest in a series of setbacks for the mission.