Turkey on Friday held a military funeral for 20 service members who died when a C-130 cargo plane crashed in Georgia earlier in the week.

The aircraft was flying from Ganja, Azerbaijan, to Turkey when it went down Tuesday in Georgia’s Sighnaghi municipality near the Azerbaijani border. Investigators are still examining what caused the crash.

Those killed included the flight crew and military technicians who had traveled to Azerbaijan to service Turkish F-16 fighter jets that took part in Victory Day events. The commemorations marked Azerbaijan’s 2020 victory over Armenia in the long-running conflict for Nagorno-Karabakh.

Families, senior officials and troops gathered at an Ankara airbase where the 20 flag-draped coffins were displayed for a ceremony. The remains were later sent to hometowns for burial.

The Turkish military has temporarily grounded its remaining fleet of 18 C-130s pending technical checks. The aircraft are central to military transport and logistics operations.

Turkey sent an investigative team to the crash site and moved the plane’s flight data and cockpit voice recorders to Ankara for analysis, the Defense Ministry said. Officials also confirmed the aircraft was not carrying ammunition when it went down.