Police are appealing for witnesses after a burglary in Ilkeston.
Offenders broke into a house on Hexham Avenue during the early hours of Wednesday, May 11.
The homeowners woke at about 2am and heard noises downstairs.
Nobody was seen in the house but the occupants later found sets of keys were missing.
A Derbyshire police spokesman said: "It's possible the burglars were disturbed."
Anyone with information about the crime should contact DC Leah Conner on 101, quoting crime number 20470/16.