YOUTHS have been spitting at passersby from one of Gloucester's multi-story car parks.
They have also been reported for dangerous driving at the NCP site, off Bruton Way, after performing 'doughnuts' in cars.
One eyewitness, who asked not to be named, said he has been subjected to abuse there.
"I was walking past the car park to get to Wetherspoon's and they were screaming abuse and throwing stuff at people right from the top of the building," he said. "You could hear tyres squealing from inside the car park. I was quite worried by it so I did actually call the police."
In the latest incident, police were sent to patrol the area on Saturday night and warned the perpetrators they risk having their cars seized if they carry on.
Community Sergeant Elenore Lakin said: "There have been a number of complaints and reports from both the public and our officers about young men behaving anti-socially in the car park.
"The incidents have included the youths performing 'doughnuts' and driving dangerously as well as throwing items off the building and even spitting at people.
"Last weekend, our local officers were joined by the road policing team to give out section 59 warnings which mean if we catch the same people doing it again we can seize their vehicle.
"We are also meeting with our partner agencies this week to discuss more measures we can take to stop this happening at all.
"We are not trying to spoil anyone's fun but this behaviour isn't on."