Two intercity buses collided at the "Don" highway in the Russian south, Sputnik reported.
"Rescuers of the Ministry of Emergency Situations took part in the operation to clear a road accident in the Novousmansky district… It was a collision of two buses," Russian emergency service said in a statement on its website.
Later a representative of the regional emergency services told Sputnik that at least three had died and three had been severely injured due to the accident, with a total of up to 37 people who suffered from wounds.
It is currently unknown what caused the tragic incident.