Police are appealing for witnesses after copper wiring was stolen from a recycling business in Leys Road, Wellingborough.
The theft happened on Monday, 7 March, sometime between 2.30am and 4.35am, when the offenders broke into WJ Redden and Sons and removed two and half tonnes of copper wiring.
CCTV footage shows that at approximately 4.20am, a vehicle possibly an estate arrived at the premises and the offenders loaded part of the wiring into it.
At 4.30am, a second car possibly a silver Citroen Picasso arrived and two men got into it before it was driven away.
Officers have released CCTV images two other men seen walking down Leys Road. One of them was wearing a jacket with a fur hood. The second was bald, with a goatee beard and was wearing a T-shirt and jeans.
Witnesses to the incident, or anyone with information, are asked to call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.