Mounted police were outside a screening of the hit Minecraft film in Lancaster after incidents including an assault on a teenage boy.
The teenager was taken to hospital with injuries after attending Vue Cinema on Church Street on Thursday.
He had gone to watch A Minecraft Movie, a film based on the popular video game Minecraft.
Police said there had been reports of "several incidents when individuals have left the cinema after watching Minecraft" and they included damage and assaults.
"We received a report of an assault on Anchor Lane, Lancaster, at around 1pm on April 10," said a spokesperson for Lancaster Police.
"It is reported that a teenage boy was assaulted following an altercation in the cinema.
"The teenager was taken to hospital with injuries and has since been discharged.
"Enquiries are ongoing, and anyone with information is asked to contact 101 quoting log 0591 of 10th."
Police horses Rosehill and Hutton were outside the cinema on Friday as part of a patrol to tackle anti-social behaviour.
"Luckily tonight they’ve helped keep things on track and are happy to report there were no issues," said a spokesperson for Lancashire Mounted Police.
"There have been reports this week of several incidents when individuals have left the cinema after watching Minecraft.
"These have included incidents of damage and assaults."
The spokesperson said the cinema "should be an enjoyable and safe environment for everyone".
Image: Lancashire Mounted Police
Incidents at screenings of A Minecraft Movie have been reported elsewhere at UK cinemas, as young viewers copy a trend popularised on TikTok.
Viral clips have shown large groups of youngsters jumping out of their seats, throwing popcorn and drinks, and screaming, during a scene in the film showing the arrival of the 'Chicken Jockey' character.
Cinemas across the country have been warning customers against disruptive behaviour during screenings of the movie.
Beyond Radio has contacted Vue Cinema. A spokesperson said they will not be making a comment.
Paralympic hero unveils life‑changing rehab bike at Royal Lancaster Infirmary
Police warning after anti-social behaviour reports at Lancaster Castle and Priory
Friend's heartbreaking appeal for help with woman's dying wish to return home
Morecambe bar unveils striking new look
Discount shop in Lancaster shuts down
Former hotel and bar on Morecambe front is sold prior to auction
Morecambe Prom reopens after car pulling trailer hits lamppost
Crackdown on crime in night time economy launched
Lifeboat crew issue parking warning after weekend call out
Police issue quicksand warning after riverbank danger for school pupils in Lancaster
Lancaster animal shelter launches 'Big Build' fundraiser to help save charity
LISTEN: Morecambe "definitely submitting a bid" to become first UK Town of Culture
Heysham Port upgrade blamed for traffic chaos 'trapping residents in their homes'
LISTEN: Tourism champs hail Eden Project and Tour de France as huge for Morecambe Bay area
Donation helps college pan ability football team to play in national championships
LISTEN: Meet the new manager of the Midland Hotel in Morecambe
LISTEN: Main contractor to build Eden Project Morecambe to be announced this month
£1.2m of funding for flood defence schemes in Lancaster district announced
Morecambe Bay hospital trust unveils new painless blood test
Thousands raised to help boost return of Lancaster Music Festival
