Extinction Rebellion are set to hold a week-long protest in Bristol.
Action is being taken in cities across the UK this week, beginning today.
The Bristol protest is likely be focussed around the Bristol Bridge area, which may result in the bridge being closed, and is scheduled to last five days.
Area commander Chief Inspector Mark Runacres, of Avon and Somerset Police, said: “We’re proactively engaging with the protestors, local businesses and the wider community to ensure people are being kept informed of any developments that may impact on their daily lives.
“Due to the potential scale of the protest and the impact it may have, we’ve had to cancel officers’ rest days to make sure we have sufficient resources in place over the five days.
“Any unplanned and lengthy road closure could impact on the ability of emergency services to respond to incidents and we and our partners are factoring this into our plans so we can continue to keep the public safe.
“Public safety will always be our main priority and we operate a zero-tolerance approach to any form of anti-social behaviour and disorder. Officers will be robust in dealing with anyone who engages in this kind of behaviour.”