Reuters: Bulgarian military helicopter crashes in Black Sea, one killed

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The helicopter, an AS 565MB Panther, crashed after carrying out a maneuver following artillery shooting drills, the ministry said in a statement, adding that the reasons for the crash are being investigated, Reuters said.

Read alsoLatvia hosting NATO's Saber Strike drills (Photos, video)The helicopter's commander died later in hospital, while the other two officers on board were in a stable condition, the ministry said.

NATO member Bulgaria has stepped up military drills over the past two years as part of the alliance's efforts to better protect the region from any potential threat from Russia.