On September 15, 2016, about 1523 universal coordinated time, a Piper PA-28-140; Colombian registration, HK1328G, operated by Aeroandes Flight Training School, and a Cessna 152; Columbian registration, HK2092G, operated by Acahel Flight Training School experienced a midair collision while operating in the traffic pattern, at Santiago Vila Airport (SKGI), Flanders, Colombia. The Piper was substantially damaged and made a precautionary landing at SKGI. The flight instructor and student pilot receiving instruction in the Piper were not injured. The Cessna was substantially damaged and experienced an uncontrolled descent into the Magdalena River. The flight instructor and the student pilot receiving instruction in the Cessna were fatally injured. Visual meteorological conditions prevailed for the instructional flights, both of which were conducted under Colombian aviation regulations.The investigation is under the jurisdiction of the Republic of Colombia. Further information can be obtained from: Grupo Investigación de Accidentes Unidad Administrativa Especial de Aeronáutica Civil Av. Eldorado 103-23 Bogota, Colombia Telephone: (57-1) 296-2138 Fax: (57-1) 296-2013 This report is for informational purposes and contains only information released by the Republic of Colombia.