Police have given the all-clear at JFK Airport after there were reports of shots fired inside Terminal 8 Sunday night, a New York law enforcement official tells CNN.

Two people had told police they heard what they thought were shots fired, law enforcement sources said. Police went floor-to-floor to clear the airport and ensure there was nothing to be found, a source said. Surveillance video from inside the terminal did not show any shooting.

Port Authority police evacuated the terminal to be cautious, spokesman Joe Pentangelo said. There were no injuries or arrests.

Hundreds of bags and suitcases were left behind as passengers ran out of the airport. Law enforcement officials say it's possible that hoax 911 calls and word of mouth led to the panic. Officials are working to figure out exactly what happened, a law enforcement official said.

In addition to the Port Authority Police, the NYPD had its Hercules Strike teams, Critical Response Command, Strategic Response Group, Emergency Service Unit, and patrol cops on scene, according to the New York law enforcement officials.

A ground stop was issued due to "security," according to the FAA command system website. It's not clear how much longer that will be in effect.

Video and photos from the scene showed hundreds of stranded passengers waiting outside the terminal.

(CNN)