Egyptian officials say three explosions in the Sinai resort city of Dahab have killed at least 30 people.
They say at least 150 other people were wounded in the blasts late Monday. There was no definitive word on the nationality of the victims.
Media reports say the explosions took place within seconds in the central part of the crowded tourist city where hotels and marketplaces are located. Ambulances and police have been pouring into the area. Witnesses say they saw smoke rising in the city
No one has claimed responsibility for the attacks.
President Bush strongly condemned the bombings as a "heinous act." Egyptian President Hosni Mubarak called the explosions terrorism and pledged to track down those responsible.
Dahab is on the Gulf of Aqaba on the eastern side of the Sinai Peninsula. The resort city is popular with foreign tourists, including Israelis. Israeli officials say they are unaware of any Israelis hurt in the explosions.
Israel has offered to send emergency teams to help with rescue efforts.
Last year, multiple bombs killed 60 people at the Sharm el-Sheikh resort on the Red Sea.