Source =
JACDEC:
The en-route altitude changed to 30,000 ft. before the pilots began their descent to Medellin at around 21:30L. The landing runway in use at the time was runway 36, meaning an approach from the south. It was dark at the time ... For reasons unknown the aircraft began to fly a holding pattern at 21.000 ft (FL210) near the Rio Negro VOR, about 17 miles southeast of their destination.
According to Colombia media, the pilots requested a holding because the flight experienced some kind of electrical problems. A minute later the pilots requested priority handling.
After one circle, the aircraft cancelled the holding and proceeded northbound its altitude gradually decreasing to 15,000 ft. before contact was lost.
The aircraft was found to have crashed against hillside in wooded, upsloping terrain ... Medellin is surrounded by mountains.
This report does not indicate that an emergency fuel state was declared. Whether or not fuel was related to the crew requesting priority handling is unclear.