Riot police arrested two leading Russian opposition figures and about 100 other people at a protest in Moscow on Sunday over claims on state television that people were paid to rally against Vladimir Putin.
Boris Nemtsov, a former deputy prime minister, and Sergei Udaltsov, leader of the Left Front, were among scores of protesters loaded into police vans at the unsanctioned demonstration outside the city's Ostankino television tower.
Several hundred Muscovites attended the protest, shouting "Shame on NTV!" and laid flowers and a miniature coffin to symbolise the "death" of the channel's honesty.
Their ire was provoked by a documentary on state-controlled NTV called "Anatomy of Protest", which aired on Thursday. The programme showed scenes of people allegedly receiving money to attend recent street protests against the rule of Mr Putin, Russia's prime minister and president-elect, and intimated that the United States was behind the subterfuge.
NTV's footage – widely reported to be fake – infuriated many Russians and prompted Sunday's demonstration, which drew up to 1,000 people.
Speaking at a meeting with supporters in central Moscow on Saturday, opposition MP Gennady Gudkov called for a boycott of NTV.
"This is a disgusting film, which is larded with lies," he said. "Its aim was twofold: to smear those who join mass protests and at the same time to frighten the people who organise them."
Police sources said that 94 people were arrested at Ostankino. Mr Nemtsov, Mr Udaltsov and others were released after being taken to police stations and will be most likely punished with fines.
NTV has not responded to the criticism and announced provocatively on Friday that "Anatony of Protest" would be shown a second time on Sunday evening.
Vladimir Burmatov, an MP from Putin's United Russia who featured in the film, called the reaction to it "collective hysteria".