A bomb exploded this morning at a St. Petersburg tribute to Vladimir Lenin, opening a gaping hole in the statue's backside, the BBC reports. “As a result of the explosion a crater of 31-39 inches appeared on the monument,” a Russian official said. The motive for the attack was unclear, and no one was hurt. The statue outside Finland Station commemorates Lenin’s return to Russia in 1917 after years of exile. (More vandalism stories.)