88 people were killed and at least 200 others were wounded in the three explosions at a hotel and at a large market.
Egyptian officials say two of the attackers were killed in the explosion they caused.
The officials say a timing device was used in the explosion of the third bomb.
Egyptian President Hosni Mubarak says the attacks would only increase the will of the nation to fight terrorism.
In Cairo on Sunday, a man was severely wounded when he dropped the bomb he was carrying and it exploded.