A Saudi Arabian diplomat whose six relatives received Irish citizenship has said he gave former Taoiseach Charles Haughey £50,000 in a horse deal.

Mahmoud Fustok told the Moriarty Tribunal by letter that the money was paid to Mr Haughey in the early 1980s to buy either a horse or a share in a stallion.

The tribunal has heard that Department of Justice officials raised questions when a total of 15 citizenship applications were received from Palestinian and Lebanese people between 1981 and 1982.

The officials were concerned that many had not fulfilled residency and notice requirements, but all applications were granted.