A UN convoy was 'appalled' when arriving in Aleppo. Rebel troops have been accused of intentionally bombing civilians in the portions of the city controlled by the state. Members of Assad's camp have claimed that while trying to siege the city. rebels have used chemical weapons. The rebel forces deny the claim. The forces trying to siege the city are splinter groups of Al Qaeda linked Nusra front. So far the rebel's bombs have killed dozens of civilians and state military.