“An explosion at a military plant in central Bulgaria killed one American citizen and injured four other people on Saturday, the U.S embassy in Sofia said. Bulgaria’s Interior Ministry said earlier in the day that the accident occurred during an experimental production test at a shooting range located in a military complex in the village of Anevo — part of the state-owned arms producer VMZ Sopot.”
Source: Blast kills U.S. citizen, injures four at Bulgarian military plant | Reuters