The U.S. government has announced the return of two Malaysian detainees from Guantanamo Bay to Malaysia, following their guilty pleas connected to the fatal bombings in Bali in 2002. Both individuals also committed to providing testimony against the alleged mastermind behind those attacks, as well as other violent incidents, according to a statement from the Pentagon released on Wednesday.

Mohammed Farik bin Amin and Mohammed Nazir bin Lep were reportedly associates of Encep Nurjaman, also known as Hambali, who is a prominent figure in the al-Qaida-linked group Jemaah Islamiya. U.S. officials indicated that the two men assisted Hambali in evading capture following the bombings that claimed the lives of 202 people at two entertainment venues in Bali on October 12, 2002.

Earlier this year, both men pleaded guilty to conspiracy and related offenses. Their transfer was facilitated after they provided testimony that prosecutors intend to use against Nurjaman, who is currently detained at Guantanamo and is awaiting the renewal of his pretrial proceedings in January concerning the Bali bombings and other charges.

With the release of these two Malaysian detainees, the population at Guantanamo Bay now stands at 27 individuals. This facility was established by President George W. Bush as part of the military response to the September 11, 2001, attacks orchestrated by al-Qaida.

At its height, Guantanamo housed hundreds of detainees, predominantly Muslim men, in what was labeled the U.S. military’s “war on terror” following the September 11 attacks. Currently, only two detainees are serving sentences, while the prosecution of seven others facing charges has been hindered by legal challenges, including issues surrounding their treatment during the initial years under CIA supervision, along with various logistical complications.

Additionally, on Tuesday, U.S. authorities sent a Kenyan national, Mohammed Abdul Malik Bajabu, back to Kenya after he spent 17 years at Guantanamo without facing any charges. His release leaves 15 men still detained at Guantanamo without charges, as the U.S. seeks countries that are willing to accept them, many of whom hail from Yemen, a nation currently embroiled in conflict and affected by the presence of an Iranian-backed militant faction.

Human rights group Amnesty International has called on President Joe Biden to take action regarding the indefinite detention of those who have never been charged before the conclusion of his term. The organization stated that failing to do so would mean that Biden is complicit in the ongoing issue of holding individuals without formal charges or trial by the U.S. government.