There have been reports of similar incidents in recent months.
A number of vehicles have been damaged after rocks were thrown along the M7 near Portlaoise.
The incident happened around 7pm on Saturday evening.
It follows reports of similar instances in the area occurring in recent months.
Any witnesses who were in the area at the time are being advised to contact Gardaí.
Laois Author Pays Tribute To Formula One Legend Eddie Jordan
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Truck Driver Jailed For Five Years Over €2.8m Cocaine Haul
The Offaly man pleaded guilty to the importation of cocaine last month.
ESB Networks Invests €6.5m In Laois Training Centre
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Offaly GAA Calls For End To Allianz Sponsorship
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Westmeath Gardaí Confiscate €7k In Illegal Cannabinoids
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Laois Councillor Honoured For 40 Years Of Public Service
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Laois Man Appears In Court After €8m Cocaine Find
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Revenue Offering Help For Couriers After Fastway Closure
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Anonymous Westmeath Man Donates Unclaimed Cash To Charity
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Midlands Macra Clubs Shine In National Awards
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High Court To Decide On Seizing Cars Used By Enoch Burke
An injunction is also being considered to prevent his family from entering Wilson's Hospital School.
Man Charged Over €8m Cocaine Seizure in Laois
He's due to appear before Portlaoise District Court this morning.
Laois TD Criticises Rural Planning Requirements
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Westmeath Company Up For Business & Finance Award
Ericsson has been nominated in the Foreign Direct Investment category.
Former Defence Force Member Jailed For Six Years Over 1981 Rape
He admitted to one count of rape before the Central Criminal Court.
