According to reports, a British citizen with a Russian student visa was detained at night in the city's Soviet District, after frightening passers-by.
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The name of the suspect is Richard Williams; the 19-year-old was studying at the Higher School of Economics, according to REN-TV.
The student was detained by the police and currently remains in custody; there were no victims reported.
The circumstances of the incident and the reasons for the boy's unusual behaviour are being investigated.