VOLGOGRAD, December 30. /ITAR-TASS/. The death toll in Sunday's terrorist act in Volgograd has risen to 17. An official at the regional Ministry of Health told Itar-Tass that a man who was in an extremely serious condition died at Clinical Hospital 25 at night.

"Physicians estimate the condition of five blast victims as utterly serious. Another eleven people are in a grave condition," the regional ministry official specified.

Seven people, who were heavily injured as a result of the terrorist act, were airlifted to Moscow for treatment by a plane of the Russian Ministry for Emergencies (RME) on Monday morning. Yet another RME plane arrived in Volgograd for a possible evacuation of other wounded to Moscow. At the city's hospitals, there remain 29 victims of the blast at the railway terminal on December 29.

Vladimir Markin, spokesman of the Investigative Committee of the Russian Federation, told Itar-Tass that the criminal case concerning the terrorist act would be investigated by the Investigative Committee Main Inquiry Directorate.

Mourning has been declared in Volgograd Region from January 1 to 3.