Alameda County's District Attorney's has promised a comprehensive investigation into the Berkeley tragedy which left six Irish students dead and seven other's seriously injured.

She's promised it will be 'thoroughly and exhaustively' investigated.

The funerals off those students who died took place this week in Ireland with the last funeral taking place on Thursday.

Lorcán Miller was the last student to be laid to rest in south County Dublin.

Mourners heard he was an extrovert who loved life and was a natural leader.

The service for the medical student was the last for the six who died in Berkeley last week.

Hundreds of mourners gathered in the grounds of the Rathmichael church on Thursday.