Police and bomb disposal experts were called to Eton after a “device” was found in a public parking lot on Sunday afternoon.
The device, believed to be from World War II, was found on the high street of the city of Berkshire.
A cordon was put in place and some people in the area were evacuated.
Police confirmed the device was safe until 8:45 p.m.
A Thames Valley Police spokesman said: “A device believed to be from World War II was found in a public parking lot on the High Street.
“The troops set up a 50 m long cordon, and some residents were evacuated as a precaution.
“Explosive Ordnance Disposal (EOD) has been called into the scene.”
In an update, they added, “A device believed to have been from World War II has been made safe through the disposal of explosives. The force is now lifting the cordon and residents can return to their properties.
“Many thanks to the residents for their cooperation when we were there.”
If you cannot see the survey, please click here