The track for the 2012 Olympic Games and Paralympic Games in London will be made from recycled guns and knives.

More than 52t of scrap metal from guns, knives and old keys that have been collected by the London Metropolitan Police will melted down to be used in construction.

This initiative is part of London Metropolitan Police effort to recycle more and find new markets for recyclable materials. It is also an effort to conserve resources, and reduce costs and energy consumption.