Two gardaí were hospitalised on Sunday night after their patrol car, which was pursuing a suspect, was rammed off the motorway.
The two officers who are stationed at Blackrock Garda Station were taken to Our Lady of Lourdes.
One was released after suffering minor injuries, while the other, who suffered head injuries, was kept over night for observation.
The incident occured at about 9pm when the patrol car began following a white Ford Transit with an English registration plate on the northbound side of the motorway, after being called to support the Traffic Corp.
The Dundalk Democrat understands that the vehicle had refused to pull over and was travelling towards the border when the incident occured.
It is believed that the vehicle in question was known to the gardaí and was identified as a suspect vehicle.
The rammng incident took place ear to Exit 15 the Castlebellingham-Tallanstown exit. The patrol car, a Toyota Avensis, was rammed with enough force that it smashed into a barrier of the hard shoulder before flipping over onto its roof.
Emergency services, including a fire crew and an ambulance, attended at the scene.
The PSNI were contacted and a fullscale search is now on for the vehicle in question.
Gardaí have appealed to public who may have witnessed the event between junction 15 and 16 to contact them.