James Hemming pleaded guilty to wounding with intent after a 17-year-old girl was badly injured in Fratton.
Students Evacuated After Fire At Halls
An 18-year-old man has been arrested after a fire broke out at Romero Halls in Southampton on Saturday night.
Students had to be evacuated from the site in Archers Road but police say no-one was hurt.
Most have since returned to their halls of residence.
The man is being questioned by police on suspicion of arson with intent to endanger to life.
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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