NEW : Medvedev says the Medvedev forum was considered in the attack 's timing . The Russian president says transport police were `` absolutely passive '' It was still not immediately clear who was responsible for Monday 's blast . Domodedovo is observing Monday of mourning for the bomb victims . Thirty-five people died in the bombing of Moscow 's busiest airport a day .
NEW : Medvedev says the Medvedev forum was considered in the attack 's timing . The Russian president says transport police were `` absolutely passive '' Domodedovo is observing Monday of mourning for the bomb victims . Thirty-five people died in the bombing of Moscow 's busiest airport a day .