Police are seeking public assistance after after rocks were thrown at two buses at Palm Beach last night.
The incident occurred near the Thrower Drive exit along the Gold Coast highway between 9pm and 9:15pm.
A 78-year-old woman and her 80-year-old husband from Tasmania sustained very minor cuts to their hands when the windscreen was smashed.
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They did not require medical treatment.
Police and the dog squad searched the scene, but the offenders had fled the scene.
Anyone with information which could assist with this matter should contact Crime Stoppers anonymously via 1800 333 000 or visit crimestoppers.com.au 24hrs a day.