A 76-year-old man from Southampton was arrested on suspicion of wearing or using an item to conceal his identity during a protest.
A 33-year-old man from Portsmouth was arrested on suspicion of obstructing a highway during violent public disorder at Eastney Marina on Sunday. A 16-year-old was also arrested on suspicion of violent disorder at the same location and time.
Separately, a man was arrested on suspicion of criminal damage to a police vehicle after walking with a breakaway group following the dispersal of most protesters.