Bomb disposal experts carried out a controlled explosion in East Peckham today.
Police were called to a home in Addlestead Road at 9.20am following reports of an unexploded device, believed to be a Second World War hand grenade.
It was thought to have been found at the rear of the property by a gardener.
A team of bomb disposal experts from the Ministry of Defence was called to the scene.
A Kent Police spokesman said residents were advised before a controlled explosion was carried out. No one had to be evacuated.
One villager said: "I heard a bang over the fields but I assumed it was just a bird scarer, I never dreamt it was the bomb squad."
Officers had left the scene by 1.45pm.