Police were called in after youths threw a firework at firefighters trying to do their job.
A crew from Hyndburn were putting out a rubbish fire on Portland Street in Accrington when a lit firework was thrown at them.
Tony Spencer, watch manager, said it was a “very dangerous” incident.
He said: “We went to a rubbish fire at the bottom of Portland Street. There have been ongoing problems with youths in that area setting fire to rubbish.
“One of them threw a firework at us while we were attending. The driver was operating the pump at the back of the fire engine when he heard the firework behind him on the floor.
“Fortunately it went off in a different direction away from him.
“Obviously it’s very dangerous to throw fireworks full stop, let alone at attending fire crews just trying to do their job.
“I don’t think the fire has been set and used to lure us there to throw fireworks at us. The fires have been an ongoing problem there for a few weeks.”
Lancashire Police said the incident happened at around 7.20pm on Wednesday, November 4.
A spokesperson said: “We had a call from the Fire Service requesting assistance as youths were a throwing firework at them.
“By the time officers got there they (the youths) had left the area, however the fire crews were concerned that they could still be vulnerable.”
The Observer reported last week that fireworks had been thrown at a police car and residential home for vulnerable people in Accrington.
Police said they are a part of a series of firework incidents in the Central area off Blackburn Road involving a group of up to around 30 youths.
Anyone with information call police on 101 quoting log number 1259 of November 4.