Police have confirmed the arrested a of third woman in connection with the double Officers still trying to trace two black men, in their 20s, who were seen running away from the scene at around the time of the incident.
A 35-year-old woman of no fixed address has been arrested in connection with the incident.
A 35-year-old woman from Portsmouth and a 26-year-old woman from Southsea who were arrested in connection with the incident were bailed until April 26.
A 50-year-old man received life-threatening injuries and a 31-year-old man sustained serious injuries.
Police are still trying to trace two men were seen running away from Somers Road, around the time of the assault. They were both described as mixed race / black, in their 20s and wearing tracksuits.
Anyone with information is asked to call 101 quoting 44170081395 / 44170081458