"Oldest Human Sacrifice" Found in Africa?

A typical sensationalist story with absolutely no explanation tendered as to why the archaeologists think this burial or burials entailed human sacrifice. When I read stories like this one, I always wonder why the person(s) who provided the information to the reporter neglects to provide pertinent details - is it perhaps that the pertinent details do not exist? Africa's oldest human sacrifice 'confirmed' in Sudan From correspondents in Khartoum February 05, 2009 02:36am (Story from Herald Sun.com.au) FRENCH archaeologists in northern Sudan say they've unearthed a 5,500 year-old Stone Age tomb which they believe confirms the location of Africa's "oldest human sacrifice". In a graveyard in Al-Kadada, north of Khartoum, the archaeologists have dug up the tomb of a man and a woman facing each other in a ditch, with bodies of two women, two goats and a dog buried nearby. The discovery "confirms'' excavations last year which found traces of the oldest human sacrifice ever identified in Africa, said Jacques Reinold, a researcher for the French section of the Sudanese antiquities department. The unearthed bones date from between 3,700 and 3,400 BC, a period considered to be one of the key stages in the transition from a hunting to a farming society. The Al-Kadada region, on fertile land alongside the Nile, is regarded as one of the cradles of humanity in the Neolithic era. Reinold's team also unearthed polished axes, a millstone, make-up palettes and ceramics at Al-Kadada.

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So, who was/were the sacrifice? The couple facing each other? One or both of the women? And what about the animals? Were they sacrifices too? How do the archaeologists know?