The United Nations has confirmed air strikes have hit trucks in an aid convoy near the Syrian city of Aleppo.

The attack came just hours after the government there declared a ceasefire was over.

The Red Cross says the bombing killed more than 10 people.

As the news was breaking, the US Secretary of State was speaking before the UN summit on refguees and migrants.

John Kerry said it is vital that aid workers in conflict zones get the protection they need: