Up to 8,000 people are taking part in an unauthorized opposition rally in central Moscow, a police spokesman told TASS on March 26.

"About 7,000-8,000 people are at the site of the unsanctioned public rally in Moscow’s Tverskaya Street and adjacent territories," the spokesman said. No detentions have been officially reported. However, a police source told TASS more than 100 people, including opposition leader Alexei Navalny, have been detained.

Read more: Police warns Muscovites against unauthorized rallies>>>