A terminal at Newark Liberty International Airport was closed Sunday after a man walked through the wrong side of the security exit. Police are looking for the man, the Transportation Security Administration says. No flights were allowed to leave from Terminal C. They aren’t sure whether the man had already been screened and then went back to the public area, or if he never went though security at all. Other travelers who reached the secure area are being moved back to the public area to be rescreened. Newark Liberty is the second-largest hub for Continental Airlines.