Russia's Defence Ministry denied Tuesday that Russian or Syrian aircraft carried out a strike that hit a UN humanitarian aid convoy in Syria's Aleppo province, state-run TASS news agency reported.
"All information about the convoy's whereabouts was known only to the militants who control these areas," the ministry statement said, appearing to blame rebel forces for the attack. No rebel factions in Syria have an air force.
The US - which has also carried out raids in Syria - charged that either Russian or Syrian planes carried out the strike on the convoy, which the Red Cross said killed 21 people late Monday, just hours after the Syrian army declared the end of a week-long ceasefire.
The attack on the convoy led the UN to halt all aid deliveries in Syria and has drawn the condemnation of the international humanitarian community.