LOS ANGELES (CBS) — Traffic lights and parking structures at Los Angeles International Airport are back on after officials cut power to the airport during morning rush hour on Tuesday.

A backup generator provided electricity to parking structures at LAX after power was first cut at 6 a.m. and lasting for over two hours before all the traffic lights on the lower level were reset.

KNX 1070′s John Brooks reports an airport spokesman said the timing of the power-down was down as a security precaution.

Los Angeles Department of Water and Power is cutting the power to make adjustments to electrical power transformers. The shutdown will not affect flights, passenger terminals or security, according to airport officials.

The airport said in a news release that it received notice that power for a utility plant, several parking structures and nearby traffic lights would be turned off in the terminal area from 6 to 9 a.m. Tuesday.

As of mid-morning, traffic reportedly normalized as upper level lighting in the parking structures returned to full power.