Japan began bombing American ships and planes at Pearl Harbor. Japanese aircraft carriers had left the Kurile Islands headed towards Pearl Harbor on November 26, 1941. Washington had sent a message which indicated the possibility of an attack on Pearl Harbor, the Phillipines, Thailand, or the Malay Peninsula. Regardless of the message Pearl Harbor was unprepared for the Japanese attack. After only a few hours of bombing, Japan had killed or wounded over 3,500 Americans.