Rescue workers say 43 dead and over a 150 people wounded in a busy market place in the heart of the city
Putin pledges to hunt down those behind the attack, ordering an intensification of Moscow's campaign in Syria
The move comes two weeks after a Russian jet crash in Sinai that militants claimed to have caused
The ceremony was broadcast live on national television, accompanied by the sound of the bell.
The IS claims to have downed the plane in retaliation for Russian air strikes in Syria, but has not said how.
Numerous Russians stranded in Egypt after Kremlin grounded all flights to country following an airliner crash in Sinai
US president says he believed there was a "possibility" that a bomb may have brought down a Russian airliner in Egypt
Islamic State group has claimed the reponsibility of the attack
The investigator based his comments on the preliminary examination of the black boxes recovered from the Airbus A321