They were Shouting "Allahu-Ahkbar"

From Eric Dondero:

Rioters threw gas cylinders into a Church a few miles away from Cairo. A riot started during a dispute between Muslim families; a dispute that appears not to have involved local Christians.

From AINA.org (h/t Pamela Geller):

A mob of nearly four thousand Muslims has attacked Coptic homes this evening in the village of Soul, Atfif in Helwan Governorate, 30 kilometers from Cairo, and torched the Church of St. Mina and St. George. There are conflicting reports about the whereabouts of the Church pastor Father Yosha and three deacons who were at church; some say they died in the fire and some say they are being held captive by the Muslims inside the church.

Witnesses report the mob prevented the fire brigade from entering the village. The army, which has been stationed for the last two days in the village of Bromil, 7 kilometers from Soul, initially refused to go into Soul, according to the officer in charge. When the army finally sent three tanks to the village, Muslim elders sent them away, saying that everything was "in order now."

Witnesses say that the rioters burning down the Church were shouting "Allahu-Ahkbar."

Photo of Christian Coptic church in Cairo, not the one burned down.