People living in Berkhamsted and Tring are being urged to secure their homes as the upmarket towns continue to be targeted by burglars.
Police have renewed an appeal to householders asking them to be extra vigilant and to check their security as, despite recent arrests, the spate of break-ins continues.
Det Insp Justine Jenkins said: “While extra resources are being deployed in the area to try to prevent further incidents and a team of detectives are working around the clock to investigate the recent incidents, we are urging people to help by looking out for suspicious behaviour and take extra security precautions.”
Recently thieves have used tools taken from garden sheds to get into homes and in some cases cars have also been taken.
Det Insp Jenkins said: “It is vitally important that people secure their sheds and garages.
“I would also advise people to not leave their car keys in view and put them away somewhere secure.
“Arrests have been made in connection with some incidents. However, we will continue to investigate these recent burglaries to find out who is responsible.
“You can help us by looking out for anyone who may be acting suspiciously in the area, or any vehicles that are out of the ordinary.”
Two homes in Grove Road, Tring, were targeted overnight on May 1. In one case crooks used a garden spade to smash through French doors and in the other car keys and a car were taken from the property.
Anyone with information that could help police are asked to contact officers by calling the non-emergency number 101 or contact crime fighting charity Crimestoppers anonymously on 0800 555111.