A Newark Airport guard who let an unidentified man breach a secure area, causing hours of flight delays Sunday, has been “reassigned to a nonscreening function, pending review” — and may be fired, the Transportation Security Administration said yesterday.

Video showed the intruder stroll past a checkpoint and through an exit lane at 5:20 p.m. and leave 20 minutes later through a different lane.

Travelers were rescreened for the next four hours as guards swept the terminal — nine days after Islamic terrorist Umar Farouk Abdulmutallab tried to blow up a Christmas Day flight.

Meanwhile, Fox News reported that TSA officials waited more than an hour after learning of the security breach to notify police.