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.
UK wide lettings agency takes over Lancaster student housing firm
Morecambe live music bar gets change of name
Firefighters put out large vehicle fire in Lancaster
Latest national rankings place Lancaster University third in north west
Work on new housing on Lancaster city centre car park continues
Lancaster District residents thanked for embracing food waste recycling
Police probe after spate of vehicle break-ins in Halton
LISTEN: Kindness has been overwhelming after Carnforth man's horrific swimming pool accident
Sisters' Morecambe Winter Gardens diaries reveal 50 years of stories
LISTEN: Lancaster and Morecambe runners take on Great North Run for great causes
Lancaster young people's mental health charity "at risk of closure"
LISTEN: Lancaster charity thrilled by new centre after long search for permanent home
Morecambe scooter rally returning after year break
'Sinkhole' appears outside Lancaster city centre shop
Fire service rescues person from coastal path at Heysham
UPDATED: Three arrests after cars stolen from house and pharmacy break-in near Lancaster
Two teenagers arrested after hour long chase through fields near Lancaster
Bid to make Lancaster On Ice a long-term annual attraction clears key hurdle
Police issue warning after report of rogue trader knocking on doors in Skerton
Competition winners announced as Morecambe Poetry Festival on track to sell out
