A bomb exploded Thursday during a raid on a home near the ancient pyramids of Giza, Egyot, killing a civilian and three policemen, officials announced.
Two of the 13 people wounded are in a critical condition, deputy governor Alaa Harass said, adding that militants were preparing explosives inside the home.
The blast comes days before the Jan. 25 anniversary of the 2011 uprising, which officials fear may be marked by protests and unrest. Egypt has been hit by a wave of militant attacks that intensified after the military overthrew Islamist President Mohammed Morsi in 2013.
The attacks, mostly claimed by a local Islamic State affiliate, have dealt a serious blow to Egypt's vital tourism sector.
The Associated Press contributed to this report.