At least two soldiers have been killed and more than 20 people injured in riots that erupted in Cairo when Coptic Christians protesting against the recent destruction of a church came under attack.<br /><br />The Copts were demonstrating outside the state television building in central Cairo on Sunday when they clashed with locals, according to Egyptian state television.<br /><br />Military vehicles were set on fire and thick black smoke rose along the Nile outside the state television building, the state-run station reported.<br /><br />During the protest, led by several Coptic bishops, the demonstrators burnt photos of Mustafa al-Sayed, the governor of Aswan.<br /><br />The Coptic church in Merinab village was attacked after al-Seyyed was reported as saying Copts had built it without the required planning permission, according to state television.<br /><br />Al Jazeera's Rawya Rageh, reporting from Cairo, said "utter chaos" prevailed in the centre of the capital.