Hostility grew within Paris between the liberal aristocrats and merchants, who wanted a constitutional monarchy, and the more radical sans-culottes from the working-class and poor neighbourhoods, who wanted a republic and the abolition of the Ancien Régime, including the privileged classes: the aristocracy and the Church. Aristocrats continued to leave Paris for safety in the countryside or abroad. On 17 July 1791, the National Guard fired upon a gathering of petitioners on the Champs de Mars, killing dozens and widening the gulf between the more moderate and more radical revolutionaries.