Bristol emergency services in chemical attack rehearsal
The emergency services have rehearsed their response to a possible chemical attack at a beer festival in Bristol.
"Casualties" were seen lying in Millennium Square on Sunday, with workers including police, the ambulance service and the fire service present.
Ch Insp Kevin Instance said: "There is no intelligence to say Bristol is going to be a target for anything like this but it's important we practise."
Police had warned of potential delays to traffic.
Ch Insp Instance, from Avon and Somerset Police, said the crews were rehearsing their response to a deliberate release of chemical agents, resulting in several casualties.
"There has been an explosion, people have been injured and we believe there is a chemical that's been released into the atmosphere," he said.
"It's a great opportunity for us to work with the emergency services and Bristol City Council in the real world, rather than testing in a classroom."
A number of the casualties were from the Amputees in Action agency.