Kabul, Afghanistan - Two people held at the US detention center in Guantanamo Bay until 2017 returned to Afghanistan on Monday, more than 20 years after they were arrested, one of the men's relatives said.

Abdul Karim and Abdul Zahir landed in Kabul early on Monday from Oman, where they had been transferred in 2017 and held under house arrest, said Zahir's son Mohammad Osman and airport staff.

"With the grace of God and efforts by the leaders of the Islamic Emirate, he has returned to the country," Osman said, referring to Afghanistan's Taliban authorities.

US authorities faced accusations of torture and abuse against prisoners at the Guantanamo Bay facility, where many were held without charge or the legal power to challenge their detention.

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Most of the people held at the military prison have been released over the years.

"I am very happy. When I woke up in the morning, I felt like it was Eid for me," said Osman.

The returnees were whisked to a VIP area away from invited media and a jostling crowd of supporters, some clutching bouquets, who had gathered for their arrival.

Zahir arrived at the controversial prison in 2002, the year it opened in Cuba in the wake of the September 11, 2001, attacks on the United States, according to Afghan Interior Ministry spokesperson Abdul Mateen and US documents.

Karim arrived in 2003, having been detained and held in Pakistan before he was handed over to US custody.

They were among hundreds of suspected militants captured by US forces during the United States' so-called "War on Terror" and held in the secretive prison.

Both men had been under surveillance without the right to travel for seven years in the Gulf kingdom of Oman, Qani said in a post on social media site X on Sunday.

"Due to the efforts of the Islamic Emirate of Afghanistan, the imposed restrictions will be lifted and they will return to their homeland," he added.

Billboards welcoming the two men back to Afghanistan were erected on the road to the airport ahead of their arrival, and a heavy security presence was deployed on Monday morning.

One Afghan man remains in detention at Guantanamo Bay, Muhammad Rahim, whose family in November called for his release.

The US government has for years said it is working to reduce the number of detainees and eventually shut down Guantanamo Bay, which lies on the island of Cuba but is under US jurisdiction.