In the early hours of February 25, 1942, less than three months after the attack on Pearl Harbor, tension along the California coast reached a boiling point. At 2:25 AM, air defense sirens blared across Los Angeles, ordering a total citywide blackout following radar reports of an unidentified target approaching from the ocean. Minutes later, coast artillery units illuminated the sky with powerful searchlights, zeroing in on a slow-moving, luminous object floating thousands of feet above the city.
Believing a Japanese air raid was underway, anti-aircraft batteries opened fire, unleashing a relentless barrage of heavy artillery. Over the next hour and a half, the 37th Coast Artillery Brigade discharged 1,430 rounds of high-explosive anti-aircraft shells into the illuminated darkness. Shell shrapnel rained down across residential neighborhoods, damaging homes, smashing vehicles, and causing several heart attacks among panicked citizens.
Despite the intense bombardment, no enemy aircraft were shot down, no bombs were dropped, and no Japanese planes were ever found in the region. Subsequent investigations by the U. S.
Navy concluded that the entire incident was a false alarm sparked by wartime anxiety and a lost meteorological research balloon released earlier that night. The floating balloon, caught in searchlight beams and surrounded by exploding shrapnel smoke, created optical illusions that convinced gunners they were engaging a fleet of hostile aircraft.