BBC NEWS: "Archaeologists working in northern Peru have discovered a spectacular tomb complex about 1,000 years old.
The complex contains at least 20 tombs, and dates from the pre-Inca Sican era.
Among the discoveries are 12 'tumis', ceremonial knives which scientists have not been able to study in a burial site before, as well as ceramics and masks.
The Sican culture flourished from approximately AD 800-1300, one of several metalworking societies which succumbed to drought and conquest.
The burial site sits on Peru's northern coast, near the town of Ferrenafe.
Discoveries in the tomb complex include tumis formed from an alloy of silver, copper and gold; masks, breastplates and ceramics.
Another set of bones, clearly from a person of some stature, were found in a seated position accompanied by a metallic crown, part of a thorny oyster, and various ceramic objects including a vase.
The tumis are a prize find, because until now the knives have come to scientists from tomb raiders. Finding them in situ would allow a closer understanding of their role in Sican culture, researchers said.
One of the tumis features a representation of Naylamp, the mythical founder of Sican society who according to legend emerged from the sea and became a god."