Bomb disposal experts are in Clenchwarton after Second World War anti-tank shells were discovered in a building site.
Police have set up a 50 metre cordon around the building site in Black Horse Road after the PIAT (Projectile Infantry Anti-Tank) gun shells were found at 11am.
Officers from the 5131 Bomb Disposal Squadron, which is based at RAF Wittering, near Stamford, are searching the site to see if there are any more shells, which will then be dealt with in a controlled explosion in the vicinity.
An RAF Wittering spokesman said: “If members of the public find anything like this please do not touch it or attempt to move it. Please call the police and will be sent out to deal with it.”