Firefighters were pelted with rubbish and fireworks they were called out to a blaze this afternoon.
Eight young lads launched the attack as crews from Burnley put out a fire in New Hall Street, Burnley.
The yobs hurled fireworks, rubbish and shouted abuse at the crews as they brought the blaze under control.
A spokesman for Burnley and Padiham Police said: "As they tried to put the fire out, the firefighters were met by eight young lads who started to throw rubbish and set off fireworks at them, hurling abusive language at them at the same time.
"Setting rubbish on fire in public after the bonfire weekend is bad enough, but to then to directly attack fire fighters as they work tirelessly to keep the community safe is simply appalling.
"This behaviour will not be tolerated.
"It is not just ‘part of the job’ and nobody working in the emergency services deserves to be treated in this way.
The lads are described as being between 10 and 14 years old, wearing grey tracksuits and one had a distinctive red top on. One was on a bicycle and one on a scooter.
Anyone who saw what happened or can provide any names is asked to ring 101 and quote log reference LC-20171106-0744.