A Turkish military transport plane crashed on the border between Georgia and Azerbaijan on Tuesday, authorities from all three countries confirmed.

The US-made C-130 plane had taken off from Azerbaijan and was on its way back to Turkey when it crashed, that country’s defense ministry posted on X. It was not clear how many crew members were on board, although standard crew sizes can range from three to five. Later reports cited the presence of 20 individuals aboard the ill-fated plane.

Video footage aired on various X posts show the aircraft spiraling down and leaving a trail of white smoke.

Turkey’s President Recep Tayyip Erdoğan indicated there were casualties but gave no further details.

He said he was “deeply saddened” and expressed his condolences for those killed in the crash.