The Main Points of Wikipedia article on the Battle of Los Angeles

The Secretary of the Navy at the time called what happened a false alarm.

The United States Coast Artillery Association it was a meteorological balloon.

There had been rumors of a Japanese aircraft carrier off the coast of San Francisco Bay.

Seattle imposed a blackout on all buldings and vehicles.

Japanese submarines had been busy of the California coast.

On Feb. 24 the Office of Naval Intelligence gave a warning on a possible Japanese attack within the next ten hours.

No American fighter planes were launched.

After the war the Japanese government said they had no planes over Los Angeles.

At one point 25 Japanese planes were said to be involved.

The anti-aircraft shell bursts were mistaken for enemy planes.

The navy said there was no evidence of enemy planes. The Army took a while before they said the reports of aircraft were greatly exaggerated.

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