A US Airways flight from Ireland has been forced to land in Philadelphia today because of an unspecified threat.

A flight from Shannon is now on the runway at Philadelphia Airport and has been isolated.

A spokeswoman for Philadelphia International Airport said officials do not have any details about the threat or where the flight was originally headed.

All passengers and baggage are expected to be screened.

According to reports, the flight was forced to land after a threat was phoned in. The FBI and Philadelphia Police are investigating.

USAirways Flight 777 from Shannon landed at Philadelphia International Airport this afternoon amid reports of a bomb threat.

Law enforcement officials met the plane on the tarmac and passengers exited the jet to waiting buses.

FBI spokeswoman Carrie Adamowski said agents were assisting Transportation Security Administration officials in the investigation.

Police and airport officials said they did not have any specifics about the apparent threat or details about from where it may have originated.

US customs officials have screening facilities at Shannon Airport and the passengers aboard the plane would have gone through them before boarding.