A 61-year-old man from Southampton has been arrested on suspicion of perverting the course of justice and concerned in the supply of class B drugs in connection with the investigation.
He remains in police custody at this time.
The arrest comes after it was reported the 17-year-old boy received gunshot wounds whilst on Bluebell Road around 10.15pm on Feb 18.
The boy remains in hospital receiving treatment for gunshot wounds to his legs and ankles.
Officers remain at the scene today (Feb 20) and continue to appeal for information in relation to this incident.
If you have any information, please contact us on 101, quoting reference number 44190059982.
In an emergency, call 999.