An attack on trucks carrying food to those in need in Syria has led the United Nations to suspend all aid convoys in the country.

18 vehicles were destroyed, with at least 20 people being killed near Aleppo.

Both Syria and Russia are denying involvement.

Stephen Ryan is from the Red Cross - he says humanitarian workers will continue to do all they can.

The United Nations says the attack could amount to a war crime if it is shown to have been deliberate.

UN Secretary-General Ban Ki-moon condemned the violence at the annual General Assembly of world leaders in New York: