Nobody was injured in the explosion on the square near Finlandsky Station, which occurred at about 4:30 a.m., police spokesman Vyacheslav Stepchenko said.
He said the bomb had the power of about 400 grams of dynamite.
The 10-meter statue, erected on Nov. 7, 1926, is one of the first examples of monumental Soviet architecture and escaped damage during the 900-day siege of Leningrad by Nazi Germany during World War II.
The statue will be dismantled Wednesday night and sent away for restoration, which is expected to cost 6 million to 8 million rubles ($17,300 to $23,500), St. Petersburg City Hall said a statement.
The Communist Party denounced the explosion as "a politically charged act of vandalism," RIA-Novosti reported.
State Duma Deputy Valery Rashkin, a Communist, said the blast might be an attempt to punish his party for its critical stance of the government during the financial crisis. "I am not ruling out that this was a kind of provocation for our criticism of authorities, an attempt to distract attention from the present-day conditions," he told RIA-Novosti.
(MT, AP, Bloomberg)
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