Burglars forced open a window to a ground floor flat near Harpenden High Street.
The break-in took place between 1am on Wednesday, January 10 and 7pm on Wednesday, January 24 at a flat on The Foresters opposite Okka restaurant.
Nothing was taken, but police have asked anyone who saw people acting suspiciously in the area around those times to phone them on 101, quoting crime reference number F2/18/211.
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