Authorities were searching for a man who walked through a screening checkpoint exit into the secure side of a terminal at a New Jersey airport on Sunday night.
Flights have been grounded at Newark Liberty International Airport, and passengers are being re-screened.
Homeland Security Department spokeswoman Sari Koshetz said a man was seen walking down an exit lane at Terminal C about 5:30 p.m. eastern on Sunday. Screening was halted in the terminal while authorities looked at surveillance tapes to identify the man.
Passengers in the Continental terminal were moved to the open side of the airport to go through screening again. The security line was emptied, and passengers were waiting in check-in areas at about 9 p.m. Continental spokeswoman Susannah Thurston said it's an airport security issue not involving the Houston-based airline.