Six police officers were injured during disturbances in the Easton area of Bristol to mark the death of Baroness Thatcher.
Avon & Somerset Police Chief Inspector Mark Jackson said: "We were called to Chelsea Road, Easton at around 12.30am today.
"Around 200 people had gathered to have a street party and refused police requests to peacefully disperse. Bottles and cans were thrown at officers, six of whom suffered injuries. One remains in hospital. A police vehicle was damaged and one person was arrested for violent disorder.
"Some small bin fires were also started and the fire service also attended."
More top news
Your latest weather update with Bob Crampton.
Bristol Mayor George Ferguson has been accused of a "nasty personal attack" in a row over how the city's Green Capital cash was spent.
Bristol Mayor George Ferguson says there will be "further breakdown" of how the city's Green Capital cash was spent.