The blast took place about 200 metres (yards) away from the church, security officials said.
Christian sites of worship across Egypt have been repeatedly targeted in attacks claimed by the Islamic State group.
A string of bombings on Coptic churches in Cairo, Alexandria and the Nile Delta city of Tanta in 2016 and 2017 killed at least 80 people.
Coptic Christians make up about 10 percent of Egypt's predominantly Sunni Muslim population of some 100 million.
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