Dereham ambulance station was targeted by burglars who stole a television and metal key case and opened staff lockers early on Wednesday morning.
Police said the thieves entered the East of England Ambulance Service on Sardis Way through a rear door sometime between 1.55am and 4.10am on November 28.
They searched five rooms in the building, and took a Sony TV and a key case.
Anyone with information should contact Dereham police station on 101, or call Crimestoppers anonymously on 0800 555111.
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