Clashes erupted on Sunday night between supporters of Egypt’s ruling Muslim Brotherhood and their opponents in Fayoum, injuring 38 people.

A health ministry official said that all of the patients received by the Fayoum Public Hospital suffered injuries from rubber bullets in different parts of their bodies, with one serious case that was transferred to Cairo.

A coalition of Islamist forces has called for a demonstration in support of President Mohamed Mursi in downtown Fayoum, while unknown assailants attacked the headquarters of the Brotherhood’s political party and tried to break into it.

The clashes evolved from exchanging insults into the usage of firearms, rubber bullets and petrol bombs.