Families may have to spend a second night away from their homes in east London as efforts to make a World War II bomb safe continue.
Army experts are working to stabilise the device
The 500lb (226kg) device was uncovered by builders at a site off Palmers Road in Bethnal Green on Monday evening.
A 220 yard (200m) cordon has been put in place as Army bomb disposal experts work to make the device safe.
About 50 residents spent Monday night with friends and relatives and faced further disruption on Tuesday.
It is understood the Army have been trying to stabilise the bomb so they can remove it and deal with it elsewhere.
Roman Road remains closed to traffic and motorists are advised to avoid the area.
A police spokeswoman said the cordon would stay in place at least until Tuesday afternoon and residents were being advised they may not be allowed home for the night.
Anyone affected by the incident was advised to contact Tower Hamlets Council on the emergency telephone number: 020 7364 7000.