MOSCOW, March 6 - RIA Novosti. About 250 people were detained in Moscow following the opposition rally against the outcome of presidential elections won by Prime Minister Vladimir Putin, RIA Novosti reports.

The Fair Elections movement attended by up to 14,000 people has later developed into unauthorized rallies.

Opposition leader Sergei Udaltsov was among the detainees. He said he is facing a 2,000 ruble ($68) fine. The court hearing date has yet to be scheduled.

After the opposition rally on Pushkin Square Udaltsov called on his supporters to stay on the square and shouted anti-government slogans.

Another opposition leader Eduard Limonov was also detained for attempted unauthorized rally in the central Moscow. He will stand trial on March 15.

The Moscow Prosecutor's Office earlier has issued warnings not to break the law to independent opposition leaders, including Boris Nemtsov, Alexei Navalny and Sergei Udaltsov.

According to official sources around 800 people took part in protest actions in St. Petersburg. About 70 were detained for chanting anti-government slogans.

The protest rally came less than 24 hours after a landslide victory for Vladimir Putin had secured him a third presidential term.

Meanwhile the Voters League alleges that thousands of violations have been committed during the March 4 presidential election.

Over three thousand violations were recorded, while more than 100 observers were expelled from polling stations, according to Voters League representative Andrei Demin.

Presidential candidate Mikhail Prokhorov said his observers exposed about 4,000 violations at the elections, many of the fraud techniques have never been seen before.

Billionaire candidate Prokhorov said he would go to the court over the election violations. Vladimir Zhirinovsky's Liberal Democratic Party is reported to be ready to support Prokhorov in his complaints.