|General view of building with shattered glass and blood stain believed to be from victim is seen Friday|
Egyptian officials have tried to calm tourists' fears of further attacks, saying the incident was likely the work of an individual using a homemade explosive device.
But in an unauthenticated Internet posting Friday, a little-known group claimed responsibility for the explosion in the Khan al-Khalili bazaar, in Cairo's Old City.
A French woman was killed in the attack, and an American died Friday from injuries. A third body has not yet been identified, but officials say it may be the bomber's.
The U.S. Embassy has warned Americans to stay away from the bazaar and to exercise caution.
Some information for this report provided by Reuters, AP, AFP.