An operation is under way to protect homes from a 1,000lb bomb found near a school in Suffolk.
An archaeologist discovered the device, which is thought to be a World War II bomb, near Kesgrave High School in Ipswich on Friday.
The building was cordoned off and bomb disposal experts are building earth banks around the device.
It is expected that some homes will be evacuated on Sunday when the device is removed to be destroyed.
Major Keith Lowerson said: "It will take about 10 hours to put protective works in and around the bomb. Police will keep a presence in the area.
"Tomorrow morning the bomb disposal officer will immunise the fuses to make sure the bomb is safe before we move it."
On Thursday evening another device was uncovered by workmen digging a hole in Lowestoft.