Russia’s Interior Ministry said two people were killed Friday, Nov 1 by a pair of hand grenade explosions in a criminal court building in the central city of Kurgan, according to RIA Novosti.

Police said that a man detonated two RGD-5 hand grenades after being stopped by security guards while trying to break through a guard post inside the courthouse.

One guard was killed in addition to the attacker. Two others were injured by the explosions. Earlier, the Federal Bailiffs Service said the attack involved three separate blasts.

A law enforcement source told RIA Novosti that the suspected attacker was motivated by unhappiness at an unfavorable verdict. However, a regional court representative later said the court had been scheduled to hear the suspect’s battery case on Friday afternoon, and that the explosions occurred before the hearing began.

Authorities are undertaking further investigations into the incident.