Villagers in Hemingford Abbots have been told to leave their homes after what was believed to be a Second World War bomb was found during building work.
Police have cordoned off the village centre as a precaution and military bomb disposal experts have been called to the scene.
Resident Josephine Wills said the device was found during building work.
“It was described as being a World War II unexploded bomb and now police have cordoned off the High Street with a police car at each end.”
Josephine said people in the vicinity had been told to stay 50m away.
A police spokesman said: “Police are currently at a property in High street, Hemingford Abbots, following reports workmen in the area have found an unexploded bomb.
“A cordon has been put in place as a precaution. The Explosive Ordnance Disposal (EOD) have been called to safely dispose of it.”