The group of five, described by eyewitnesses to be two taller teenagers and three shorter, have reportedly been throwing rocks at cars near the Gunnedah Town Hall.

It's believed they may have turned on all the taps in the bathroom at Wolseley Oval in an attempt to flood it.

Police believe the incidents are connected and "more than likely" committed by the same group of teens.

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Residents have taken to the Thumbs Up Thumbs Down of Gunnedah Facebook group to express their frustration and anger.

"Just a heads up for everyone there is five young teenagers, two taller teens and three shorter who have just rocked and damaged my car while my dad was driving around the round about at the town hall around 8pm. They have run into Wolseley Park and vanished. Police have been notified," Luce McCoy wrote on Tuesday night.

Bob Mc said his daughter's car was hit at the roundabout.

"My daughter's car was damaged earlier tonight, 8pm, by a rock or lump of concrete thrown by one of five young cowards, near the town hall roundabout," he posted on Tuesday night.

"When approached, these little heroes took off in all directions, with the three smaller fools, running off at the mouth big time."

He said one of the boys was wearing a pink or orange coloured top with white print and a smaller boy had dark, curly hair.

Gunnedah police Leading Senior Constable Damian Wood said they officers had not identified the teenagers responsible and called for witnesses.

"Unless they're captured on CCTV doing that it's very difficult to see if it's the same people [but] more than likely they're the same people responsible," he said.

Constable Wood said residents had also come forward with complaints that rocks had been thrown at their houses in Conadilly Street, George Street, and View Street.

Anyone with information is urged to contact Gunnedah police on 6742 9099 or CrimeStoppers on 1800 333 000.