All arrivals and departures out of Terminal 4 at John F. Kennedy International Airport were temporarily closed on Sunday due to a "security incident," involving an unattended bag officials said.

Port Authority police were investigating the potential security threat at the terminal on Sunday afternoon, where inbound traffic was shut down. The incident was cleared before 12:30 p.m., though, and arrivals and departures were reopened soon after with residual delays.

A Port Authority spokesperson said there was no evacuation, and that passengers were only relocated within the terminal from the departures level to the arrivals level. The bomb squad was on the scene and cleared the bag "after determining there was no device," the spokesperson said.

Footage posted on Twitter showed crowds of people outside of the terminal on Sunday afternoon.

JFK's Terminal 4 is one of the airport's most active terminals and services more than 30 international and domestic airlines.

This story was updated with additional comment from the Port Authority.