An opportunist thief stole a laptop computer from a house in Tylers Close, Kings Langley, on Saturday morning.
The thief reached through an open living room window to steal the laptop, which had been left on the arm of a sofa in the living room.
Police are now advising residents to be cautious if leaving windows and doors open during warm weather.
Anyone with information should telephone police on 0845 3300 222
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