Protesters and Police Clash at 'March of Millions'

Opposition protesters standing on Ulitsa Bolshaya Yakimanka, on the march route to Bolotnaya Ploshchad. In a gray vest at middle right is prominent poet and journalist Dmitry Bykov.

Lines of riot police and trucks arrayed along Bolshoy Kamenny Bridge at the northwest end of Bolotnaya Ploshchad.

Police detaining two opposition demonstrators at Bolotnaya Ploshchad.

Riot police facing off with opposition protesters outside Bolotnaya Ploshchad.

Riot police hitting a demonstrator with their batons.

A riot policeman bleeding from the head from a wound inflicted in clashes with demonstrators. More than 20 officers were injured at Sunday's protest, police said.

Riot police arresting a demonstrator at Bolotnaya Ploshchad. Police said around 450 people were detained at Sunday's rally.

Riot police running at opposition demonstrators with batons raised. At least an estimated 50 demonstrators were injured at the rally Sunday.

A protester fighting with a riot police officer at Bolotnaya Ploshchad.

A riot policeman stepping over an injured demonstrator at Bolotnaya Ploshchad.

Riot police on Bolotnaya Ploshchad dragging a demonstrator, who with his hand is making the international sign for peace.

Police detaining State Duma deputy from the Just Russia party Ilya Ponomaryov as photographers document the incident.

Opposition leader Ilya Yashin, center, in a human chain at Bolotnaya Ploshchad.