A Bulgarian military helicopter crashed during a training exercise near the southern city of Plovdiv, killing two of the three men onboard, the defence ministry said.
"Two of the crew -- the commander and the co-pilot were killed in the fall of the helicopter. The third crew member -- the board mechanic -- was immediately transported to hospital, (he was) conscious," the ministry said in a statement.
The cause of the accident was not immediately known, it added.
The helicopter was Bulgaria's only operational Mi-17 chopper and mainly used for firefighting in difficult terrains.
The accident is the second deadly crash involving a Bulgarian military helicopter in the last 12 months.
A risky manoeuver and bad weather were then cited as causes of the accident but Bulgarian President Rumen Radev, a former airforce chief, also blamed insufficient flight hours.
Bulgaria's outdated military equipment, most of which was bought during communism and is Soviet-made, has often caused tensions in the military, with pilots at the country's major Graf Ignatievo airbase refusing to fly MiG-29 jets last October over safety concerns.
Public tenders for new equipment have been sidetracked for years. But last Friday Bulgaria's parliament approved plans to spend more than 3.2 billion leva (USD 1.9 billion) on new fighter jets and armoured carriers.
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