An air force spokesman says 24 people are feared dead after a military aircraft crashed into an airport hangar.
Six crew, an instructor and 17 special forces trainees were on board the Fokker 27, which went down on Monday in the city of Bandung in stormy weather.
Air force spokesman Bambang Sulistyo said the cause of the crash was unknown.
Ambulances were on the scene.
A witness identified only as Mujiono told the Antara state news agency a giant fireball engulfed the aircraft on impact.