A INTRUDER alarm system frightened off a burglar after they gained entry to a house.
The alarm went off after the intruder entered a house in Tring Road, Northchurch, by forcing entry to an conservatory window and then an internal patio door.
Police believe it happened in between Tuesday, December 21 and Monday, December 27.
Another burglar was kept out on Christmas Eve as they attempted a raid at Manor Road, Tring, during daylight hours.
They tried to force the front UPVC door, but found it double-locked.