A roadside bomb hit a tourist bus near the Giza Pyramids, wounding at least 17 people including tourists, Egyptian officials said.
The officials said the bus was travelling on a road close to the under-construction Grand Egyptian Museum, which is located adjacent to the Giza Pyramids but is not yet open to tourists.
The bus was carrying at least 25 people mostly from South Africa, officials added.
The attack comes as Egypt's vital tourism industry is showing signs of recovery after years in the doldrums because of the political turmoil and violence that followed a 2011 uprising that toppled former leader Hosni Mubarak.
Officials said security forces cordoned off the site of the explosion and the wounded were taken to a nearby hospital.