MOSCOW (Reuters) - Several thousand people protested in central Moscow on Monday against what they said was a fraudulent parliamentary election, shouting "Revolution!" and calling for an end to Prime Minister Vladimir Putin's rule.

The protest, a day after an election in which Russians sharply reduced the parliamentary majority held by Putin's United Russia party, appeared to be one of the biggest opposition demonstrations in Russia in years.

Protesters initially gathered in the rain on a tree-lined boulevard where they had permission for a rally. They denounced the vote as shameful and shouted "Russia without Putin!"

Many protesters then tried to march out onto a major street and were confronted by a chain of police officers who locked elbows and divided the surging crowd into two parts. Several people were detained in the area.

Several dozen protesters managed to break through or circle around the police and marched toward the Kremlin. Police detained at least 30 near the Kremlin and bundled them into buses.

(Reporting by Thomas Grove and Maria Tsvetkova, Writing by Steve Gutterman, Editing by Timothy Heritage)