A flight at Newark Liberty International Airport was evacuated on the tarmac Saturday morning after a flight attendant noticed something “suspicious.”

At about 7:45 am, a flight attendant on JetBlue Flight 573 “identified some type of suspicious item,” then contacted the Port Authority Police, PA spokesman Rudy King said. King couldn’t provide details of the suspicious item.

Video posted to Twitter showed a line of police cars in an area near the gates and a bus pulling up to take passengers to the terminal. Other social media posts showed luggage spread out on the ground below the aircraft.

A JetBlue spokesman confirmed the flight was scheduled to depart Newark for Tampa, Fla. About 150 passengers were on board the Airbus A320.

The passengers were taken to the gate, King said, and the aircraft is being investigated by PAPD K9. The luggage is going to be re-screened

The Federal Aviation Administration’s website said traffic at the nation’s most delayed airport was experiencing a “gate hold,” meaning all flights were being kept at the gates rather than being allowed to taxi to the runway.

Additional reporting by Stephanie Pagones