CCTV has emerged showing US troops armed with assault rifles mistakenly storming a privately-owned sunflower oil factory in Bulgaria.
They were taking part in a Nato military exercise, with the aim of clearing the airbase next door, but ended up at the wrong coordinates and encountered civilian workers.
The incident happened on 11 May.
No shots were fired and the US Embassy in Bulgaria says it is "fully investigating the cause of this mistake".
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