The Biden administration transferred a detainee from the detention facility at Guantanamo Bay, Cuba, on Thursday and is preparing to transfer at least two more in the coming weeks, according to two senior U.S. officials and a former senior administration official.

Majid Khan left Guantanamo early Thursday and arrived in Belize several hours later, the officials said. He is the first detainee to be resettled by the Biden administration and one of the few to be sent to a location in the Western Hemisphere.

A Pakistani citizen and Guantanamo’s only known legal U.S. resident, Khan was granted asylum while attending high school near Baltimore in 1998. He returned to Pakistan in 2002 and, according to a Defense Department detainee assessment, joined Al Qaeda and became a direct subordinate to Khalid Sheikh Mohammed, often known as KSM, Al Qaeda’s senior operational planner and the principal architect of the terrorist attacks of Sept. 11, 2001.