US computer giant Sun Microsystems has refused to send two expert witnesses to Hong Kong to testify in a case alleging the illegal sale of a supercomputer to a PLA weapons research institute, a court heard yesterday. Prosecutor Louisa Lai Nga-man sought an adjournment to allow time to take statements from the witnesses in the United States. 'Sun Microsystems has said it will not send its two employees to Hong Kong to testify,' Ms Lai told Sha Tin Court. 'In light of this, we will have to interview the witnesses in the US.' She said summonses would be issued by a US court and statements taken from the two witnesses in America. Magistrate Josiah Lam Wai-kuen adjourned the case until December 14. Hong Kong-based Automated Systems is facing three charges of importing, and one of exporting, strategic commodities without a licence. The company denies all charges. Automated Systems allegedly imported three high-performance Sun Microsystems computers into Hong Kong and re-exported one of them, an Enterprise E5000 Network Server, to the mainland between February and August 1997, without proper licences. The computer is said to have found its way to the Changsha Institute of Science and Technology, which is involved in research on advanced weapon systems for the PLA. The latest development has caused further delay in the Government's case. Earlier the Government had difficulties contacting the expert witnesses through US Customs.