Archaeologists have found a 4,000-year-old flint axe during a dig on the new 2012 Olympic site in east London.
"The unfinished axe, which archaeologists believe was deliberately placed in waterlogged ground, was among several items found during Britain's largest ever search.
Others included skeletons buried in graves around an Iron Age settlement, a Roman coin and mediaeval and Neolithic pottery.
The Olympic Park is being built on a former industrial site in east London.