A Muslim Brotherhood supporter was shot dead by unidentified assailants in Damietta on Monday in a demonstration denouncing death sentences announced earlier, security sources said.
An Egyptian court sent on Monday the files of Muslim Brotherhood leader Mohamed Badie and 682 others to the country's Grand Mufti over violence in Minya that followed the overthrow of President Mohamed Mursi last year.
The court also sentenced 37 Muslim Brotherhood supporters to death and 491 others to life in the same hearing.
Police forces combed the Damietta neighborhood where the confrontations took place on Monday, arresting a number of Brotherhood supporters, an Aswat Masriya eyewitness said.
The suspects were then referred to a prosecutor over allegations of inciting violence, rioting and belonging to a terrorist organization.
Egypt's interim government declared the Brotherhood a terrorist organization towards the end of last year.