James Hemming pleaded guilty to wounding with intent after a 17-year-old girl was badly injured in Fratton.
Three Arrested Over Bournemouth Stabbing
Dorset police are investigating a stabbing in Bournemouth.
Officers were called to a block of flats on Christchurch Road in Boscombe just before midnight on Monday (23 June) after reports a man had been stabbed.
They found him in a nearby building where three people were arrested.
They are in custody helping police with their enquiries and the victim is being treated for his injuries.
Officers are continuing their investigation today.
Dorset and Hampshire officers will be carrying out extra patrols until New Year's Day.
Hampshire Police have dealt with more than 100 cases in a year of people being blackmailed over intimate webcam images.
£600 was stolen after workers at Coral on Columbia Road were threatened with an axe.
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