For the first time in my life, I was stopped for an immigration check, which was on a metro platform in Sofia (Bulgaria). A police officer told me something in Bulgarian, and when I said (in Bulgarian) that I don't speak Bulgarian, his face changed and he said "bla bla bla pasport!" whereby I showed him my ID. As he spoke no English, he silently gave it back after 45 seconds.

In which cities is this common for this to happen in the underground? I've heard of it being the case in Tashkent (Uzbekistan)

closed as too broad by Ivan, Karlson, A E, blackbird, chx Oct 24 '16 at 17:42

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    What makes you think it was immigration check? Rather than a simple document check. – Karlson Oct 24 '16 at 17:17
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    @Karlson What's the difference? Isn't the purpose to establish whether the person is in Bulgaria legally? Besides, he only asked for it upon realising I was a foreigner – Crazydre Oct 24 '16 at 17:19
  • This is not Bulgaria specific and it's not limited to foreigners or to check the legality of presence. Very similar practice happens in Russia. – Karlson Oct 24 '16 at 17:20
  • @Karlson Right, and what I wonder is in what places this is common. Russia does not surprise me. In Tbilisi (Georgia) there was always one or two officers in the metro, but they only ever said "hello" to me at the most – Crazydre Oct 24 '16 at 17:21
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    @MichaelHampton no. There is no obligation to identify yourself unless the police issue a summons or arrest you. See nyclu.org/node/3249. – phoog Oct 24 '16 at 17:33