Two Indonesian Air Force EMB-314 Super Tucano light attack turboprops crashed on Thursday morning in the East Java region.
Footage from a video shows the two planes destroyed on the ground. Later, the Air Force confirmed that these were aircraft registrations TT-3103 and TT-3111.
The Indonesian Air Force later reported finding the bodies of the four occupants. The aircraft would have collided in different locations on a mountain in the region.
According to the Air Force statement, the four Super Tucanos took off from Abdulrachman Saleh Air Base in Malang, East Java, for a training mission at 10:50 am (local time).
At 11:18 am, air traffic control lost contact with the turboprops while two of them returned to base. According to reports, the four planes were spinning in a “box” formation at an altitude of 8,000 feet.
Indonesia ordered 16 EMB-314 aircraft from Embraer in 2011, but had lost one of the turboprops in a 2016 crash.
The Super Tucano is an evolution of the EMB-312 training turboprop, and capable of carrying out advanced training and light attack. It is operated by around 18 countries on different types of missions.