LOS ANGELES, Calif. (KTLA) -- A passenger jet bound for London was cancelled at LAX Saturday night after someone phoned in a bomb threat, airport authorities said.

The threat against United Flight 934 was made from a pay phone about 6 p.m., sources told KTLA partner the Los Angeles Times.

"The aircraft has been relocated to an isolated area on the airfield as a precautionary measure," said Sgt. Belinda Nettles, spokeswoman for the airport's police. "A unified command has been established with Los Angeles Airport Police, the Federal Bureau of Investigation, LAFD and the LAPD Bomb Squad at the location for assessment and investigation."

The Boeing 777 was set to leave for Heathrow Airport shortly before 6 p.m., according to flight reports. The flight was at first delayed but was cancelled sometime after 8:30 p.m.

The plane was taken to an isolated area at LAX, and a bomb squad used dogs to search the aircraft, the Times reported. Airport police later told KTLA that nothing dangerous was found on the plane.

The FBI, Los Angeles Police Department and Los Angeles Airport Police responded to the scene.