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CORRECTED-Police detain Russian opposition politician ahead of protest

(Corrects day to Saturday)

MOSCOW, Aug 10 (Reuters) - Russian opposition politician Lyubov Sobol, an ally of Kremlin critic Alexei Navalny, said on social media on Saturday she had been detained by police ahead of a protest in Moscow.

A video posted on Sobol's Twitter account showed police entering her office. (Reporting by Maria Kiselyova and Tom Balmforth; editing by John Stonestreet)