Floral tributes and candles have been left by mourners in memory of the victims of the metro bombing in St Petersburg.
The tributes were left at an improvised memorial on Moskovsky Prospekt Street near the entrance to Tekhnologichesky Institute station.
The seven people were from Central Asian countries and investigators say they were recruiting for IS.
The bombing of a subway train in Russia has drawn condemnation from world leaders.
A blast has ripped through an underground train in Russia's second-largest city on Monday.