A gang of boys on bikes rode rampage through Asda in Brighton Marina, knocking down shoppers as staff tried to tackle them.
About ten boys rode into the store at about 3.30pm on Sunday, through the supermarket and then the check outs.
More reports were made around the marina over the following hour and it was only when police arrived at 4.30pm that the gang dispersed.
Mother-of-one Sarah Lewis, who was shopping in the store, said: “It was quite a shock as a lad on a bike cycled through a checkout further down the store and staff tried to tackle him.
“There was a noise from the shop side and I looked up from packing our bags I saw more and more boys on bikes being tackled by staff as they were trying to ride through the check outs.
“The last one came right next to us and cycled into a woman using sticks. He started yelling abuse at her to get out of the way.
“I was worried for her safety as well as my six-year-old daughter, who was thankfully out of their way.
“It all happened so quickly. Everyone looked shocked and surprised.”
An Asda spokesman said: “We are pleased that none of our customers were harmed at our Brighton Marina store on Sunday afternoon, however we do not tolerate this unacceptable behaviour in our stores.
“We are proud that our colleagues acted quickly to remove the trespassers from the store within a matter of minutes to ensure our customers were not disrupted for too long, however we would again like to apologise for the inconvenience.”
A spokeswoman for Sussex Police said: “Police attended Brighton Marina around 4.30pm on Sunday (June 23) to reports of a large group of young people on bikes displaying anti-social behaviour.
“The group left the area a short time after and no crimes were reported.”