Ian ClarkePolice are investigating a suspected arson attack which severely damaged three lorries, three vans and two cars at a Dereham highways depot.Ian Clarke

Police are investigating a suspected arson attack which severely damaged three lorries, three vans and two cars at a Dereham highways depot.

Two Dereham fire crews had to break locks to get in to the Trek Highway Services compound at Hall Road on the Greens Road industrial estate about 10.10pm on Saturday night and the vehicles were 'well alight.'

Trek is a growing company which provides a wide range of services for road schemes, such as traffic control and maintenance.

One caller to the fire service said there had been a group of youngsters hanging about in the area of the depot at the time of the blaze.

Police scenes of crime officers visited the compound yesterday morning as part of the investigations.

A strong theory is that a fire was started in one vehicle and it spread to the others.