Attacks on firefighters are increasingly being filmed on people's phones, the body representing them has said.
The Fire Brigades Union (FBU) Wales said firefighters have faced fireworks and rocks thrown at them, as well as abusive comments over the past decade.
The union said attacks could put lives at risk by slowing response times down.
Gareth Tovey from FBU Wales said: "The worst thing is, it means that we need to potentially withdraw from that situation and we have to remember we were only ever there to go and make sure people are safe."