WASHINGTON — The United States has transferred two Malaysian detainees at the Guantanamo Bay U.S. military prison to their home country after they pleaded guilty to charges related to deadly 2002 bombings in Bali and agreed to testify against the alleged ringleader of that and other attacks, the Pentagon said Wednesday. Prosecutors say Mohammed Farik bin Amin and Mohammed Nazir bin Lep worked for years with Encep Nurjaman, known as Hambali, an Indonesian leader of al-Qaida affiliate Jemaah Islamiyah. That includes helping Nurjaman escape after bombings on Oct. 12, 2002, killed 202 people at two nightspots in Bali, U.S. officials said. The two men entered guilty pleas to conspiracy and other charges in January. Their transfer comes after they provided testimony that prosecutors plan to use against Nurjaman, the alleged mastermind, the Pentagon said in a statement. Nurjaman is in custody in Guantanamo awaiting resumption of pretrial hearings in January involving the Bali bombings and other attacks. The two Malaysian men’s transfers leave 27 detainees in custody at the U.S. naval base in Guantanamo Bay. Then-President George W. Bush set up a military tribunal and prison after the Sept. 11, 2001, al-Qaida attacks on the United States. At its peak, Guantanamo detained hundreds of men, most of them Muslim, in the U.S.-led global war on terrorism after the attacks. Just two of the men at Guantanamo are serving sentences. U.S. prosecution of seven others currently facing charges has been slowed by legal obstacles — including those presented by the torture of the men in their first years under CIA custody — and logistical difficulties. Kenyan held 17 years On Tuesday, U.S. authorities repatriated a Kenyan man, Mohammed Abdul Malik Bajabu, after 17 years at Guantanamo without charge. His release leaves 15 other never-charged men awaiting release. The U.S. is searching for suitable and stable countries willing to take them. Many are from Yemen, a country split by war and dominated by an Iranian-allied militant group. Amnesty International urged President Joe Biden to end the detention of those never-charged men before he leaves office. If not, the rights group said in a statement, “he will continue to bear responsibility for the abhorrent practice of indefinite detention without charge or trial by the U.S. government.”