Egypt ? Police fired live ammunition into the air and lobbed tear gas into rioting crowds of Christians and Muslims on Sunday in a third day of sectarian violence in Egypt’s second-largest city.

One Muslim man reportedly died Sunday of his wounds. Police said 40 people had been wounded in clashes and 80 had been arrested over the weekend.

The riots were touched off Friday by knife attacks at three Coptic Christian churches, which killed one man and wounded up to 16 other people. A mentally ill man is being held in the stabbings.

Some 2,000 police fought back Sunday against 200 Coptic Christians who fled into St. Maximus Church in Alexandria, after the mob began hurling stones and bottles. Other demonstrators tossed Molotov cocktails from the balconies of nearby buildings.

Police were seen beating a young Coptic boy, who was among the crowd that fled. Later, a huge mob of what appeared to be Muslim protesters charged the police cordon from the other side.

Sporadic scuffles continued after nightfall Sunday.