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The Syrian Red Crescent convoy was heading to Aleppo when it was reportedly hit by an airstrike just hours after the end of the US-Russia brokered ceasfire in the war-torn country.

A statement from the activists said: "Martyrs and wounded among civilians were reported, some of them are still stuck under the rubble, in Aleppo city and its suburbs, due to bombardment and artillery shelling."

(Image: TWITTER)

Syrian Obsevatory say at least 32 people have been killed.

It is unclear whether the airstrike was carried out by Russian warplanes or Syrian government forces.

Staffan de Mistura, the United Nations' Special Envoy for Syria, voiced his "enormous" outrage at the attack tonight.

In a statement, he said: "The convoy was the outcome of a long process of permission and preparations to assist isolated civilians."

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"It started with an hour of extremely fierce bombing," said Besher Hawi, the former spokesman for the opposition's Aleppo city council. "Now I can hear the sound of helicopters overhead. The last two were barrel bombs," he said, the sound of an explosion audible in the background.

Abu al-Baraa al-Hamawi, a rebel commander, said the most intense bombardments had taken in place in areas west of Aleppo, the same area where the aid convoy was hit. "The regime and Russians are taking revenge on all the areas," he said.

(Image: GETTY)

The aid convoys had been arriving regularly from Turkey, with their contents mostly supplied by regional and international charities.

The Syrian military could not immediately be reached for comment.

The aid convoy was struck while traveling to Urm al-Kubra in Aleppo.