Anti-fascist protesters marching in Brighton are stopped from entering an area where right-wing supporters had gathered.
The march was re-routed in North Street and St James street was also closed.
Sussex Police had warned of disruption in the city after nationalist-affiliated groups indicated their intention to meet up and socialise.
A separate street party-style gathering has also been held in Churchill Square by about 75 UK Uncut supporters.
More than 10 people have been arrested on suspicion of possessing drugs and public order offences.
Mounted police have been on the streets as part of Sussex Police's strategy to cope with an "exceptionally busy" four days in the city.