On 15 April 1969, a Navy EC-121 reconnaissance plane was shot down by North Koreans about southeast of the North Korean port of Chongjin. U.S. radar tracked two Korean People's Air Force (KPAF) MiGs before the aircraft was shot down. They attempted to warn the aircraft, but the MiGs caught up with the slow-flying aircraft. All of its 31 crew members were killed. The bodies of only two crew members were recovered. Error was blamed on a North Korean ground-to-air controller's command and control error to the pilot.