A Garda search team recovered more than 1,000 bullets in the home of a son of billionaire businessman Jim Mansfield, a court has heard.

A man who failed to appear as a witness at the trial in April of his brother-in-law for allegedly threatening to kill his wife has now left Ireland, Dublin Circuit Criminal Court was told.

Judge Frank O'Donnell has called for an investigation into why a man did not answer his witness summons at a Dublin Circuit Criminal Court trial of his brother-in-law who was charged with threatening to kill his wife.