Update: 7:41 p.m.: The grounding order has been lifted:
The ground stop at LAX has been lifted. All departure flights will have expected 1 hour delays. Check with airlines for flight status— LAX Airport (@flyLAXairport) April 30, 2014
The problem was reportedly related to computer issues with the FAA.
Original story: Computer issues have forced all flights scheduled to leave several Southern California airports to be grounded indefinitely, local media reports.
Arrivals continue to be accepted but departures are being held on ground. No ETA on when it will be lifted. Contact FAA/airlines for details— LAX Airport (@flyLAXairport) April 30, 2014
If you had a flight scheduled for LAX this afternoon, please check with your airline before coming to the airport. Ground stop in effect.— LAX Airport (@flyLAXairport) April 30, 2014
The closures affect other area airports, including Bob Hope Airport in Burbank, John Wayne Airport in Santa Ana and Ontario International Airport.
NBC Los Angeles reports:
It was not clear how long flights would be forced to stay on the ground. "Right now, we are in a slow period at the airport, but we don't know how things will look at 5 p.m.," LAX Spokeswoman Nancy Sue Castles said.
The nature of the glitch was not immediately known.