Police are investigating the possibility that a gun was fired at an address in Ipswich.
Officers were called to Kelly Road following concerns from a member of the public about the safety of a resident who had damage to their front door.
No-one is believed to have been injured, but it is thought a firearm could have been discharged, Suffolk Police said.
It is believed the incident happened during the early hours of Sunday morning.
Any witnesses or anyone with any information should contact Suffolk Police on 101 quoting incident number 195 of Sunday 5 November.