"On April 20, 2001, as part of a Peruvian-U.S. counternarcotics airbridge denial program (ABDP), a Peruvian Air Force (FAP) A-37 aircraft interceptor fired on a civilian floatplane carrying five U.S. citizens after mistaking its behavior for that of a narcotics trafficking aircraft. A U.S. aerial tracking aircraft initially detected the aircraft and provided the information used to follow and intercept the floatplane. Two U.S. citizens in the floatplane were killed during the interception. As a result of this accident, the United States and the Government of Peru (GOP) agreed to a joint investigation of the facts related to the interdiction of the aircraft, owned by the Aviation Company of the Association of Baptists for World Evangelism (ABEM), and make recommendations that would help avoid such a tragedy in the future."
U.S. Department of State: http://www.state.gov