A skip loader was stolen from a Carpenders Park building site overnight.
Officers are investigating the theft of a one tonne skip loader, which was taken from a site on the corner of By The Wood and Greenfield Avenue.
Hertfordshire Constabulary believe the theft took place between 4.30pm yesterday and 8.25am this morning.
Thieves reportedly broke through the metal fencing around the site and removed the yellow truck, which had a red bucket.
Officers are unsure whether the skip loader was driven out of the site or loaded onto another vehicle.
Police are appealing for anyone who saw the truck to contact them on the non-emergency number 101, quoting crime reference number C3/14/925.