At least 25 people were killed when a bus crashed into a truck in Russia's central Vladimir region, the RIA Novosti news agency reported on Thursday quoting emergency ministry officials.

"The bus and the KAMAZ truck collided some 124 kilometers away from Moscow on the road to Vladimir, and the bus caught fire. At least 25 people were inside," officials said, adding that four people were rescued and hospitalised in serious condition. It was not immediately clear what caused the accident.