A man arrested on suspicion of attempted murder has been bailed in connection with the incident, which occurred in Ipswich last week.
Police were alerted just after 12.20am on Tuesday 22 November, to reports of a loud noise at Siloam Place. A few minutes later police received a call from the ambulance service reporting someone had been attacked at the same location and had injuries to his upper arms.
Officers attended the address where the incident was said to have happened, however no one was found at the property. Enquiries got underway to determine what had occurred.
Around 1.20am police took a further call reporting that an 18-year-old man had arrived at Ipswich Hospital just before 1am with a suspected gunshot wound to his shoulder. He has received treatment for his injuries, which are not life threatening. The young man who was injured is not believed to be from the Ipswich area.
The 28 year old man from Ipswich has been bailed to return to Martlesham Police Investigation Centre on 23 February 2017.
Four other men arrested on suspicion of GBH on Tuesday following the incident in Siloam Place were released on police bail on Wednesday to return to Martlesham Investigation Centre on 21 February 2017 while inquiries continue.
Enquiries are continuing regarding the incident at Siloam Place.
Police are asking anyone who may have seen anything in the Siloam Place area of Ipswich during the course of Monday evening or into the early hours of Tuesday to call Suffolk Police on 101, quoting CAD number 17 of Tuesday 22 November, or Crimestoppers, anonymously if required, on 0800 555 111.