'Los Angeles Air Raid'
The so-called "Los Angeles Air Raid" was the first incident involving unidentified aerial phenomena to spark a government investigation. Various radio reports and visual sightings of luminous objects in the sky over the Los Angeles area, on the night of February 24–25, 1942, culminated in the firing of 1,430 anti-aircraft shells. Although the incident has never been conclusively explained, it seems reasonable to assume that "war jitters" may have been at least partly to blame. Only two days earlier, a Japanese submarine had surfaced north of Santa Barbara and shelled fuel storage tanks for 20 minutes, while on the same evening President F. D. Roosevelt made a nationwide broadcast warning that nowhere in the United States was safe from enemy action.