Bones found at a prehistoric burial site indicate they belonged to victims of an ancient massacre, say scientists.
Remains of 14 people were discovered at Wayland's Smithy, near Uffington White Horse, Oxfordshire, in the 1960s.
Latest techniques date the bones at between 3590 BC and 3560 BC, and have led experts to believe the people may have died in a Neolithic Age massacre.
Michael Wysocki of the University of Central Lancashire says the findings suggest the Neolithic Age was more violent than previously thought. The victims - three of them probably killed by arrows - could have died in a rush for land or livestock, he added.
He said: "We know one person was shot through the lower abdomen because we have found the tiny tip of a flint arrowhead embedded in their pelvic bone.
"We also know that the bodies of two people were scavenged and partially dismembered by dogs or wolves before their remains were buried in the monument.
"All this new evidence suggests that the period between 3625 BC and 3590 BC may have been one of increasing social tension and upheaval."