Terminal C at Newark Liberty Airport terminal was locked down and flights were delayed after a man walked the wrong way through a checkpoint exit.

The Transportation Safety Administration said police are still searching for the man, according to CNN.

The man entered the “sterile” section of the airport and apparently bypassed security screeners by going the wrong way through a checkpoint exit.

Passengers were herded into public areas and Terminal C was locked down while security staff reviewed video to see exactly where the man, who may not have been screened, had gone.

The potential security breach comes as the TSA announced it was beefing up security with random searches, with extra screening measures for passengers from “countries of interest” such as Yemen.

The incident is reportedly causing arrival delays Sunday night.