An explosive device in a bag was discovered by police close to a church in Cairo, Sky News Arabia reported Friday.
The device reportedly detonated as officers checked the suspicious item.
One Egyptian police officer was killed while another was injured in the explosion, Sky News Arabia said.
There was no immediate confirmation from local authorities or any immediate claim of responsibility.
The incident occurred less than two days ahead of the January 7 Coptic Christmas celebrations in Egypt.
Christians reportedly account for some 10 percent of Egypt’s largely Muslim population.