Bomb disposal experts have discovered the grenade found in Whitehill Avenue this morning was not live.
Police were called at around 9.25am with reports that a military-style hand grenade hand been found in Luton.
A cordon was put in place in Whitehill Avenue and houses were temporarily evacuated as a precaution.
Explosive Ordnance Disposal officers arrived at the scene and examined the grenade but found it to be empty.
The cordon has now been lifted and emergency services have been stood down.