UN Secretary General Ban Ki-moon said Wednesday that he was disturbed by clashes between Christian Copts and Muslims in Egypt, days after fresh violence in Cairo left 12 people dead.

Ban expressed concern that it could affect the recent progress towards democratic reform.

"I am disturbed by the recent violence between Muslims and Copts in Egypt after the prolonged display of national unity that led to the peaceful transition of power," the UN Secretary General told journalists.

"It is critical that the people of Egypt maintain that unity of purpose for .. their democratic aspirations," he added.

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