The Museum of the City of San Francisco article on theLos Angeles air raid, main points of the article

On the 24th of 1942 naval intelligence gave a warning that an attack would occur within the next ten hours.

Radar picked up an object 120 miles west of Los Angeles.

No planes were launched to investigate the object.

Anti-aircraft bursts were mistaken for enemy aircraft.

There were no bombs dropped.

The Navy later said there was no evidence of Japanese planes.

The Fourth Air Force agreed but the Army waited a day to say anything.

The New York Times said 'If the batters were firing on nothing at all, as Secretary Knox implies, it is a sign of expensive incompetence and jitters."

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