Youths threw bricks at passing cars in the Shankill area of north Belfast last night.
Police say young children, some of whom were believed to be around 10 years old, were involved in the incident.
The trouble occurred at the North Boundary Street junction with the Shankill Road at 6.30pm last night (Sunday, May 2).
Police say it was reported that two Metro buses were stoned in the area.
Sergeant Bethel said buses were pulled from the area for a time as a precaution.
“It’s concerning that young children, some of whom were believed to be around 10 years old, were involved in this incident. I’m appealing to those responsible to think of the potential consequences of such actions. It’s not just the follow-on disruption; you are risking the safety, even lives, of those on-board.
“We will continue to work alongside local representatives and partner agencies, but it is disappointing that some people continue to disregard our repeated warnings,” he said.
“Parents and guardians, I am appealing to you to do everything you can to prevent young people from becoming involved or caught up in these activities. Know where your children are, who they are with and what they are doing.
“Anyone with information should contact us on the non-emergency number 101.”
Information can also be provided to Crimestoppers anonymously on 0800 555 111 or online at www.crimestoppers-uk.org.”