A bomb attack killed six people, including three policemen, on Thursday near a road leading to the pyramids in the Cairo suburb of Giza, security sources said.
The bomb exploded as the police arrived in their vehicles in front of a building where suspected militants were hiding, the sources said. Thirteen people were wounded.
The Interior Ministry issued a statement saying the bomb had been planted by Muslim Brotherhood militants and went off when security forces tried to raid the building.
The deputy governor of Giza, Alaa Harass, says two of the wounded in Thursday's explosion are in a critical condition.
The blast comes days before the January 25 anniversary of the 2011 uprising, which officials fear may be marked by protests and unrest.
Militants have stepped up attacks on Egyptian soldiers and police since the army toppled president Mohammed Morsi of the Muslim Brotherhood in 2013 after mass protests against his rule.
The attacks have dealt a serious blow to Egypt's vital tourism sector.
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