A police spokesman said all of those inside the car were youths. They were later found on a street in nearby Henderson.
"No firearm was located and it's believed the initial report may have been the result of glass bottles being smashed by the group."
A witness at the scene in Henderson, where the youths were found in the vehicle, said all officers who arrived were armed and a dog unit was also there.
"Officers armed were guarding a vehicle of interest - a Mazda.
"A short time later, police officers marched a young male in cuffs down... and into a nearby police car."
One of those involved has been charged and is due to appear in the Youth Court.