Police are investigating the death of a 45-year-old man while in police custody in the Siberian city of Tyumen.
The man, whose name has not been released, died after being detained late on March 30 on a minor offense.
He reportedly became unwell shortly after being detained and died before an ambulance arrived at the station.
Cases of alleged police abuse have been in the news in Russia lately, after a man died earlier this month in the city of Kazan after allegedly having been beaten and raped with a glass bottle.
Earlier this week, four police were charged in the asphyxiation death of a detainee in the Siberian city of Novokuznetsk.
Police reform has been a major initiative of the presidency of Dmitry Medvedev.
Based on reporting by AFP and Interfax