An explosive device detonated on Tuesday...

The blast occurred at 04:15 (01:15 GMT) and hit a maintenance rail car on the Bronevaya-Ligovo line near St. Petersburg"s Baltic Station. The train driver suffered a leg injury.

The bomb exploded with the power of 200 grams of TNT and left a crater one meter in diameter, but failed to seriously damage the train. A criminal investigation has been opened.

Rail traffic was halted on the line, but was resumed later on Tuesday, Russian Railways said.

The incident comes two months after the luxury high-speed Nevsky Express between Moscow and St. Petersburg was derailed by an explosion, killing 27 passengers and injuring more than 90.

MOSCOW, February 2 (RIA Novosti)