Few know that the second attack on Pearl Harbor by the Japanese occurred on March 4th 1942 just 3 months after the initial devastating attack. Called Operation K, two Japanese flying boats flew across the Pacific from Japan where they were refueled by submarines before flying to Oahu. Each plane carried four 550 lbs bombs.
The mission was to reconnaissance Pearl Harbor and bomb the repair and salvage operations. The Japanese originally planned to use five Kawanishi H8K long range boat planes but only two were available at the time of the mission. The raid would be one of the longest bombing missions flown in the war.
They approached the islands around 1 am when radar stations on Kauai spotted the planes. P-40 Warhawk fighters were scrambled to intercept but heavy cloud cover prevented them from finding the Japanese planes flying at 15,000 ft. On Oahu, an island-wide blackout meant to deter air raids and the same thick cloud cover prevented the two planes from identifying Honolulu and Pearl Harbor at night.
One plane dropped its bombs in the ocean near the entrance to Pearl Harbor and the other dropped bombs near President Theodore Roosevelt High School on the slopes of Tantalus Peak north of Honolulu. No one was injured and damage was minimal with a few broken windows at the school. Both the US Army and US Navy blamed each other for the explosions, each accusing the other of jettisoning munitions over Tantalus Peak.
The Japanese attempted the same mission again with a single plane on March 10th 1942 but it was shot down by Navy fighters over Midway Atoll.