KIEV, August 31. /TASS/. A powerful explosion has occurred outside the building of Ukraine’s parliament in downtown Kiev and around 30 people have been injured, a TASS correspondent reports from the scene.

The ambulances sent to be explosion scene are not enough for all the injured people. Police vehicles have joined the effort to take the wounded persons to hospitals.

Earlier reports said an unknown man had thrown a ball grenade at the police cordon near the building.

Some five or seven people have received serious injuries, while the others have sustained moderately severe wounds, local media reports say.

The clashes outside the parliament building have not ended, and activists are throwing smoke bombs at police. The central square is covered with heavy smoke.