The Muslims claimed that a Coptic merchant had tried to sexually harass the girl, they said.
Police arrested the merchant as well as 10 Muslims who allegedly took part in the unrest, including pelting police with stones, they added.
Copts, who make up between six and 10 percent of Egypt's 83-million population, have suffered an increase in attacks since a popular uprising ousted Hosni Mubarak in early 2011, leading to a breakdown in security.
Islamist President Mohamed Morsi, who was elected in June, has pledged to be the "president of all Egyptians" but many among the minority Christian community say they fear for their future under Islamist rule.
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Police arrested the merchant as well as 10 Muslims who allegedly took part in the unrest, including pelting police with stones, they added.
Copts, who make up between six and 10 percent of Egypt's 83-million population, have suffered an increase in attacks since a popular uprising ousted Hosni Mubarak in early 2011, leading to a breakdown in security.
Islamist President Mohamed Morsi, who was elected in June, has pledged to be the "president of all Egyptians" but many among the minority Christian community say they fear for their future under Islamist rule.
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