On the crossroad of the central streets- Bayron and Moskovian- was set off an explosion in the evening October 22. According to the police officers arriving at the site, a grenade exploded. As result of the explosion, the Caucasus media institute vice-president, journalist Mark Grigorian was injured. Some cars near the site of the occurrence also were damaged. According to the witnesses, the explosion took place in the evening 20.15-20.30. Case investigation is launched.