The trial of six men charged in connection with a high-speed car chase last May in which two teenagers died has opened at the Circuit Criminal Court in Cork.

The trial was told that the roots of the incident lay in a dispute between two families, the Murphys and the Heaphys.

Sixteen-year-old CJ Dolan and 19-year-old Derry O’Callaghan were both fatally injured when the Mondeo they were backseat passengers in went out of control and crashed into the wall of a house on Harbourview Road in Cork last May.

The Prosecution said jurors would hear evidence that the Mondeo, driven by one of the defendants, James Simms, was travelling at speeds of 120km/h along the road, closely followed by a Volkswagen Golf driven by another defendant - Philip Murphy.

James Simms, 28, has pleaded not guilty to dangerous driving causing the deaths of the two teenagers as has 40-year-old Philip Murphy.

Philip Murphy, along with his brother Thomas, Shane Ahern, and James Quilligan, have also pleaded not guilty to the false imprisonment of another man Darren Linehan earlier in the evening.

It is alleged the four men kicked and punched Mr Linehan before bundling him into the boot of the Golf and driving him to a nearby cemetery where they attacked him again.

This followed an earlier incident in which the sixth defendant, John Heaphy, allegedly threatened to petrol bomb the Murphy's house - a charge denied by Mr Heaphy.

The case is being heard before Judge Patrick Moran and a jury of eight men and four woman.

The trial could last for up to three weeks.