An improvised bomb exploded outside the walls of a church in the Egyptian city of Fayoum on Saturday, causing no injuries but damaging part of the building's facade, Al-Ahram's Arabic news website reported.
Explosives experts have dismantled another bomb at the site.
Fayoum is around 100 kilometres southwest of Cairo.
Bombs targeting the security forces and state infrastructure are commonplace; attacks on churches by militants have also been reported.
Earlier in the day, three judges and their driver were killed when gunmen attacked their minibus in Arish in North Sinai