The “Los Angeles Times–Extra” of February 24, 1942  has one of the more dramatic, screaming headlines to be found in any newspaper: “L.A. AREA RAIDED ! ” with a smaller head noting: “Jap Planes Peril Santa Monica, Seal Beach, El Segundo, Redondo, Long Beach, Hermosa, Signal Hill”. The report begins: “Roaring out of a brilliant moonlit western sky, foreign aircraft flying both in large formation and single, few over Southern California early today and drew heavy barrages of anti-aircraft fire–the first ever to sound over United States continental soil against an enemy invader…” (see).
The Battle of Los Angeles, also known as The Great Los Angeles Air Raid, is the name given to this rumored enemy attack and subsequent anti-aircraft artillery barrage which took place from late February 24 to early February 25, 1942 over Los Angeles. The incident occurred less than three months after the United States entered World War II as a result of the Japanese Imperial Navy’s attack on Pearl Harbor.
Initially, the target of the aerial barrage was thought to be an attacking force from Japan, but speaking at a press conference shortly afterward, Secretary of the Navy Frank Knox called the incident a “false alarm.” Newspapers of the time published a number of reports and speculations of a cover-up. Some modern-day UFOlogists have suggested the targets were extraterrestrial spacecraft. When documenting the incident in 1983, the U.S. Office of Air Force History attributed the event to a case of “war nerves” likely triggered by a lost weather balloon and exacerbated by stray flares and shell bursts from adjoining batteries.
Air raid sirens sounded throughout Los Angeles County on the night of February 24-25, 1942. A total blackout was ordered and thousands of air raid wardens were summoned to their positions. At 3:16 am the 37th Coast Artillery Brigade began firing .50 caliber machine guns and 12.8-pound anti-aircraft shells into the air at reported aircraft; over 1,400 shells would eventually be fired. Pilots of the 4th Interceptor Command were alerted but their aircraft remained grounded. The artillery fire continued sporadically until 4:14 am. The “all clear” was sounded and the blackout order lifted at 7:21 am.
Several buildings and vehicles damaged by shell fragments, and five civilians died as an indirect result of the anti-aircraft fire, three of them killed in car accidents in the ensuing chaos and two of heart attacks attributed to the stress of the hour-long action. The incident was front-page news along the U.S. Pacific coast, and earned some mass media coverage throughout the nation.(credit to Wikipedia)