Police officers remain at The Grange in Southwark, SE1, where a suspected unexploded WWII bomb was discovered by builders this morning.
Officers were called at 09:18hrs on Monday, 23 March, to the location where building works are currently underway.
The unexploded bomb is thought to be approximately 5ft long and 1000lbs in weight.
A cordon of 200 metres has been implemented as a precaution, whilst this incident is dealt with.
This will be in place overnight and into tomorrow, Tuesday, 24 March.
Police are working with colleagues from the London Fire Brigade, London Ambulance Service and Southwark Council.
Army bomb disposal experts are also on scene.
As part of this work, a number of residential addresses have been evacuated.
A careful operation is being planned to make the device safe. There are a number of road closures and traffic diversions in the area and motorists are being urged to find an alternative route.