Moscow rally in support of political prisoners

Protesters demand freedom for those jailed and detained at an anti-Putin rally in Bolotnaya Square in May 2012

About 4,500 people gathered at a rally in Moscow to urge Russian President Vladimir Putin's government to free political prisoners, according to police estimates.

Protesters are demanding freedom for jailed and detained participants of an anti-Putin rally in Bolotnaya Square in May 2012, according to a Facebook page posted by demonstrators, who had planned to bring together as many as 20,000 people.

Rally participants are also supporting others they deem political prisoners, including jailed oil tycoon Mikhail Khodorkovsky, Pussy Riot punk band members and detained Greenpeace activists, reports from the site.