Police are appealing for witnesses and reminding residents to not to leave their keys near to locks after a burglary in Haverhill.
The incident occurred at around 5am this morning, Wednesday 21 May, in Ash Grove.
The occupants were woken by a bang followed by noises downstairs and so called the police, who arrived at the scene shortly afterwards.
Officers found a side door open and it would appear that the offender had reached in through the cat flap and accessed the door key which was hanging on a hook beside the door. No items were found to have been stolen.
Anyone with information about this incident is asked to contact DC Andy George at the Bury St Edmunds Priority Crime Team on 101 quoting reference HH/14/982, or Crimestoppers anonymously on 0800555111.