On July 11 two cars collided on a small road in Donegal killing eight people. Shaun Kelly (22), one of the drivers, the sole survivor, has been questioned by police.
Police are still waiting for the results from forensic tests before their can take their investigation to the next level.
Seven of the men killed were in Kelly's car when they crashed on the R238 road between Clonmany and Buncrana in Donegal. In the other car, Hughie Friel (66) was killed as he returned home from bingo.
The seven men in Kelly's car all died at the scene. They were Mark McLaughlin (21), from Fahan; Paul Doherty (19), from Ballyliffin; Ciaran Sweeney (19), of Ballyliffin; PJ McLaughlin (21), of Burnfoot; James McEleney (23), of Clonmany; Eamon McDaid (22), from Buncrana and Damien McLaughlin (21), from Buncrana.
Shaun Kelly was the sole survivor of the crash and suffered serious injuries to his face and upper body. He underwent treatment in Dublin before being transferred to Letterkenny General Hospital. Although he has not made a full recover he has been released from hospital.
Police has already conducted an interview with the young man at his family home.
Superintendent Kevin English is heading up the investigation. He declined commenting on the interview but told BreakingNews.ie that the investigation was "progressing well".
He said "A substantial number of witnesses have come forward and we have had excellent co-operation from the public.
The results of the forensic tests are expected in the coming weeks. Kelly was convicted of dangerous driving in 2007 and the police are trying to gather evidence that would point to the possible cause of the accident. A motorist who was overtaken by Kelly's VW Passat on the night of the crash has said that he was driving at excessive speed. Most of the men in the car were not wearing seat belts.
Kelly was still in hospital while his friends were being buried. At their funerals that families stressed that they bore no malice towards the driver.