Egyptian Clerics Warn of Civil War Amid Increased Tensions

Urging opponents of Morsi not to hold rallies

(Reuters) - Egypt's leading religious authority warned of "civil war" on Friday and called for calm after a member of the ruling Muslim Brotherhood was killed ahead of mass rallies aimed at forcing the president to quit.

"Vigilance is required to ensure we do not slide into civil war," the Al-Azhar clerical institution said in a statement reported by state media. It blamed "criminal gangs" who attacked mosques for street violence. Clashes linked to the political tensions have killed five and wounded scores in the recent days.