The Hawai'i Kai post office was slightly damaged yesterday morning when a customer drove his car into a window.

"One of our customers drove up over the stop blocks — I guess he thought he was in reverse but he went forward instead," said David Thibeault, post office supervisor.

The incident at the post office, at 7040 Hawai'i Kai Drive, was reported to police about 7:20 a.m.

"We weren't open for business, so there was nobody in the office and no one was injured," Thibeault said.

The car broke a smaller 3-by-5-foot window below the main picture window, he said.