A large number of mortar shells have been discovered at a building site in Staffordshire.
As a precautionary measure, a cordon was put in place at the site in Burntwood and local businesses were evacuated to ensure public safety.
People are being advised to stay away from the area while police deal with this incident. Bomb disposal experts are expecting to be at the site until tomorrow.
It is around the sixth time in the last two years that ammunition has been found at the site, near a Morrisons supermarket on the A5190 Milestone Way at Burntwood, near Lichfield.
A spokesman for Staffordshire Police said: "Following the discovery of a large number of mortar shells, as a precautionary measure, a 200m cordon is in place and local businesses have been evacuated. "We are advising people to stay away from the area while we deal with this incident." The spokesman for Staffordshire Police said checks were being carried out to see if the shells have already been disarmed.
Over the last two years mortars and hand grenades have been discovered at the site, where around 400 homes are being built.
The housing estate is being built on an area which was used as a "spent munitions dump" in the late 1940s and 1950s.
There were previously calls for building to be suspended at the site pending a full investigation.
House builders Barratt Homes and Taylor Wimpey said at the time that the sites had been thoroughly investigated below ground level in accordance with planning conditions.
Full site analyses were also carried out.