A group of teenagers are assaulting people, being verbally abusive and causing criminal damage in Chipping Sodbury and Yate.
Avon and Somerset Police said officers had made arrests and investigations continue regarding the spate of anti-social behaviour.
In a statement, the police force said a dispersal order was in place to give officers extra powers to direct someone to leave the area.
The statement added: “Most of the incidents which are being investigated happened on the evening of Tuesday, March 10.
“Two young men aged 17 and 18 were subjected to an unprovoked assault by a group of younger boys on a path between Horseshoe Lane and Hounds Road, Chipping Sodbury.
See the crime rates in your neighbourhood, powered by In Your Area:
“Both needed hospital treatment for cuts and bruises after being punched in the head and torso. “Two boys aged 15 and 16 have been arrested and released under investigation in connection with this, while another 16-year-old boy is due to be interviewed in the coming days.”
Police said around the same time a 13-year-old girl was pushed and kicked by two girls on the same path, but didn’t suffer any visible injury.
“A 14-year-old girl has been interviewed and officers are following positive lines of enquiry,” the statement continued. “A man has also reported being verbally abused in the same area at around the same time.
“Officers are investigating another incident on the same evening in which a 21-year-old man was assaulted by three boys in East Walk, Yate, suffering bruising and a bite mark.
“The group is also thought to have been involved in a public order incident outside the Horseshoe pub on Thursday, February 27, in which a pushbike was damaged and a metal sign thrown at a wall.”
Neighbourhood sergeant Terry Murphy said they knew people were sharing information about incidents on social media.
He said: “But we really do need people to tell us if they’re affected by ASB as it happens, so we can take appropriate action.
“If someone could get hurt, or property is being damaged, ring 999 straight away. Otherwise call 101 or report it online through www.avonandsomerset.police.uk/contact ”
The officer added that it was important for anyone reporting offences or ASB to pass on as much information as possible about those responsible, including descriptions of clothing or vehicles.
Police have already identified a number of teenagers whose parents or carers will be contacted.
Advice for parents
Mr Murphy continued: “It’s important for parents and carers to make sure they know where their children are, who they’re with and what they’re up to.
“Talk to them about the consequences of this sort of behaviour – for themselves as well as others.
“Criminal damage and public order offences could lead to arrest.
“Any conviction could affect a young person’s future career or even travel plans, with some countries denying visas to people with criminal convictions.”