Officers from the Met Police were called at about 4pm.
The force believes the device had been there “for some time”.
Randolph Close and surrounding local streets have been evacuated.
A HARTteam has also been scrambled to support teams
Officers have called in specialists and a large cordon has been put in place.
A number of residents have been taken down to the station whilst the device is being made safe and an all clear is even to the effect area.