SAN DIEGO -- Lindbergh Field's Terminal Two was shut down briefly after a small security breach took place, according to airport officials.

Around 10 p.m., San Diego Harbor Police said they noticed an alarm at a checkpoint may not have been working properly.

As a precatuion, passengers were taken off their planes and re-screened through security.

Many departing flights were delayed and those aboard planes that had just arrived were kept on the tarmac for several hours.

Airport security operations began to normalize just after midnight.