An American Airlines flight has been grounded at SFO after a bomb threat. According to the Transportation Security Administration, reports CBS 5, "the threat was made against American Airlines Flight No. 24 — which was destined for John F. Kennedy International Airport in New York." The airport police "received a threatening phone call" just before the flight was about to takeoff.

The plane was moved to a a remote tarmac for safety reason. Crew members and passengers were "escorted off the plane and were being interviewed and re-screened while airport police swept the plane itself for any suspicious devices."

Update: The flight was grounded for a hijack threat. "Two people were detained on a plane that was grounded at San Francisco International Airport on Thursday after authorities said the jetliner was the target of an apparent hijacking threat."

Passengers sent Twitter messages from inside the plane.