Where is the location of the Bulgarian arms depot that experienced explosions in 2015?

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The article of Radio Free Europe/Radio Liberty reports on a series of explosions at a Bulgarian arms depot in 2015 and the ongoing investigation into the incident. Bulgarian authorities have found evidence that the explosions were caused by sabotage and have linked the attack to the ongoing conflict between Russia and Ukraine. The article also mentions concerns about the security of arms depots in the region and the potential for similar incidents in the future.