MOSCOW - Two liberal Russian media outlets and an election watchdog said their sites had been shut down by hackers intent on silencing them over allegations of violations in a parliamentary vote on Sunday.
One publication accused state bodies of interference.
Prime Minister Vladimir Putin's ruling United Russia party could see its vast parliamentary majority cut back in the vote, which is widely viewed as a test of his popularity ahead of an expected return to the presidency early next year.
Sites belonging to the Ekho Moskvy radio station, online news portal Slon.ru and the Western-financed watchdog Golos went down at around 8 a.m. (0400 GMT).
"There is the feeling that the Central Election Commission, the prosecutors and the hackers are acting together," Maxim Kashulinsky, general director of Slon.ru, told Reuters.