A police station in Norfolk came under siege in the early hours when a group of about 100 people hurled beer and wine bottles at the building.
Fifteen people have been arrested after a police station in Norfolk came under siege in the early hours from a crowd of 100 people hurling bottles.
The attack in Great Yarmouth happened after police arrested three people in a van carrying sound equipment.
The attack in Great Yarmouth happened after police arrested three people in a van carrying sound equipment.
Police said 200 officers then broke up an "unlicensed music event" at a warehouse on Harfrey industrial estate outside the resort just before midday.
Police said 200 officers then broke up an "unlicensed music event" at a warehouse on Harfrey industrial estate outside the resort just before midday.
Fifteen arrests were made and 44 cars were seized, the police spokesman said.
Forty-four cars were seized at the event, a police spokesman said.
'Serious risk'
'Serious risk'
The attack on the police station was declared a major incident by Norfolk Police and Ch Supt Bob Scully said: "We acted swiftly to control the situation and restore order.
The attack on the police station was declared a major incident by Norfolk Police and Ch Supt Bob Scully said: "We acted swiftly to control the situation and restore order.
"What occurred was entirely unacceptable and inexcusable.
"What occurred was entirely unacceptable and inexcusable.
"This was large scale anti-social behaviour and officers dealing with the incident were put at serious risk.
"This was large scale anti-social behaviour and officers dealing with the incident were put at serious risk.
"It is behaviour that won't be tolerated."
"It is behaviour that won't be tolerated."
Two police vehicles were damaged and officers narrowly avoid serious injuries, police said.
More than 100 officers from Norfolk, Suffolk, Essex and Cambridgeshire police forces took part in the operation, which finally ended at 1030BST.
People have been warned to stay away from the Harfrey industrial estate, which is being treated as a crime scene.
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