Egyptian archaeologists have discovered the five tombs northeast of the pyramid of King Merenre I, who ruled Egypt around 2270 BC.
The 101-metre structure just south of Cairo that marks a key step in the evolution of pyramid construction has been opened to visitors.
Officials say South Africans and Egyptians are among those injured when an explosive device went off, hitting the bus in Giza.
Egypt's archaeological team has found silos containing animal bones and food, indicating human habitation as early as 5,000 BC. That would be some 2,500 years before the Giza pyramids were built.
The void is the first inner structure found since the 19th century inside the monumental tomb. The question remains: what could it be?
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