Several hundred residents have been evacuated from their west Leeds homes after an 6ft long unexploded World War II bomb was discovered.
An Army bomb disposal team from Catterick was called in to deal with the device but had to call for reinforcements from Cambridge.
The area around Coal Hill Lane in Farsley has been closed and many people are spending the night elsewhere.
Police said it could be Friday morning before they can go home.
The device, said to look like a beer barrel, was found on a building site at 1115 BST on Thursday.
Police said the building site was evacuated and a decision was later taken to move the residents.
On Thursday evening people were taking suitcases with them to Stanningley Rugby Club in preparation for spending the night there.