This article was reproduced with the kind permission
of the British Broadcasting Corporation
10 November 2007, 14:59 GMT
A large group of youths threw them at two crews when they attended a rubbish fire in Moston Road, Harlescott, on Friday night.
Shropshire Fire and Rescue Service said it was the latest in a line of attacks.
A spokesman warned lives were being put at risk because the ongoing incidents meant less crews being available to cover the rest of the area.
'Firefighters at risk'
Station officer Paul Fulgoni said two crews were now sent to every suspicious blaze in Harlescott to ensure firefighters were protected from assaults.
It is believed youths are deliberately starting fires then attacking the crews who attend. In one recent incident a firework was set-off at a fire engine.
"It increases the risk of a slower attendance time to incidents in the rest of Shrewsbury," he said.
"It's part of an ongoing situation with the Harlescott area and it's putting our firefighters at risk because we're not normally used to having this sort of abuse."