NEW YORK May 31 (Reuters) - Argentina settled with additional creditors holding defaulted sovereign bonds for just under $163 million, the court-appointed mediator in the long-running case said in a statement on Wednesday.

The agreement ends 10 years of litigation with Luxembourg- and British Virgin Islands-based investment funds known as the HWB Entities, said the statement from mediator Daniel Pollack. The individual investors in the funds - HWB Victoria Strategies Portfolio, HWB Funds and U.V.A. Vaduz - are primarily from Germany.

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"Several weeks ago the HWB Entities attempted, unsuccessfully, to attach two military helicopter engines belonging to the Argentine Air Force in repair at GE facilities in the United States," Pollack said.

However, after U.S. District Judge Thomas Griesa, who has presided over the case, called for both sides to return to the negotiating table, an agreement was reached on the bonds, which were denominated in both U.S. dollars and euros.

The nominal value of the bonds was not disclosed.

This latest settlement was made within the same terms as the February 2016 agreements Argentina reached with its largest creditors, who held out from two previous sovereign debt settlements. Those agreements ended 14 years of bitter legal battles and allowed Argentina to re-enter the international capital markets and fund economic development.

With the latest agreement, Pollack said, Argentina believes 98 percent of all holdout creditors have reached a settlement with Buenos Aires, nearly closing the book on a roughly $100 billion sovereign debt default in early 2002.

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"It is my hope that the few remaining 'holdout' claims will be resolved in the next six to 12 months," Pollack said. (Reporting by Daniel Bases; Editing by Dan Grebler)