Police have evacuated a road in West Watford after builders found a suspected hand grenade this afternoon.
A bomb disposal van was seen heading into Burton Avenue off Whippendell Road at 4.30pm.
Police taped off the road and sealed off Southsea Avenue.
A Hertfordshire Constabulary representative said the force was alerted to the device after it was uncovered by builders carrying out renovations at a property in Burton Avenue.
Officers have sealed off a 100-metre perimeter around the house and have moved residents out of the area.
Onlookers said a small crowd was gathering at the end of the road while police officers guarded the house where the device was found.
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