The tribunal was told Mr Carthy works for the United Nations and is based in Vienna.

BBC: Harry Breen and Bob Buchanan were murdered by the IRA in 1989

Kevin Carthy, who retired last year, was accused of treating the tribunal with contempt.

BBC: Harry Breen and Bob Buchanan were murdered by the IRA in 1989

Senior counsel for the tribunal, Mary Laverty, said she was at a loss to explain why Mr Carthy had not turned up.

BBC: Harry Breen and Bob Buchanan were murdered by the IRA in 1989