A bomb went off outside a military enlistment office in St.

Petersburg, the local news website Fontankareported Tuesday, citing eyewitnesses.Local residents reported hearing sounds of explosions near the enlistment office around noon on Tuesday.Authorities cordoned off a nearby abandoned bomb shelter, which Fontanka said sustained “minor damage.”Investigators believe the explosion occurred inside a shaft that leads to an abandoned bomb shelter, some 20 meters from the military recruitment office, according to Fontanka.The outlet described the explosive device as a battery-powered “radio module” fitted with 100-150 grams of gunpowder.Security camera footage shared by Fontanka showed police tape surrounding a pockmarked road in the courtyard of an old building. It was unclear if the asphalt shown in the footage was damaged as a result of the reported blast.The outlet said there were no injuries.