Terrorists used 4 kilos of TNT to blow up a trolleybus in Volgograd on December 30.
5-day mourning has been announced in Volgograd Oblast.
Mass check-ups of registration are being conducted in Volgograd now. Special attention is paid to visitors, ITAR-TASS reports.
The two terrorist acts in Volgograd (at the railway station and in the trolleybus) seem to be connected, the Investigation Committee claimed. Both blasting assemblies had a similar construction.
Cossack squads will be patrolling Volgograd streets in crowded places.