NEW : Medvedev says the Davos forum was considered in the attack 's timing . Comment: This is the criteria used to choose the time and place for committing that act of terrorism . ` Moscow is observing a day of mourning for the bomb victims . Thirty-five people died in the bombing of Moscow 's busiest airport Monday .
NEW : Medvedev says the Davos forum was considered in the attack 's timing . Comment: Moscow is observing a day of mourning for the bomb victims . Thirty-five people died in the bombing of Moscow 's busiest airport Monday .