In Egypt, three Vietnamese tourists and an Egyptian tour guide were killed and 11 others injured when a roadside bomb exploded near Giza pyramids in Cairo yesterday.<br />''<br />''In a statement, country's interior ministry said, the bus was carrying a total of 14 Vietnamese tourists and travelling in the Marioutiyah area near the pyramids when the roadside bomb went off.<br />''<br />''Security forces rushed to the area immediately and opened an investigation into the explosion. No one has claimed responsibility for this blast. <br />'' <br />