Archaeologists say they have found the largest funerary complex yet dating from the earliest era of ancient Egypt, more than 5,000 years ago.
The necropolis was discovered by a joint US and Egyptian team in the Kom al-Ahmar region, around 600 km (370 miles) south of the capital, Cairo.
Inside the tombs, the archaeologists found a cow's head carved from flint and the remains of seven people.
They believe four of them were buried alive as human sacrifices.
The remains survived despite the fact that the tombs were plundered in ancient times.