A former Guantanamo detainee has sent at least 2,500 terrorists from Saudi Arabia and some from Yemen to join the ranks of the Takfiri group operating in Iraq and Syria, ISIL, a report said on Wednesday.

A former Guantanamo detainee has sent at least 2,500 terrorists from Saudi Arabia and some from Yemen to join the ranks of the Takfiri group operating in Iraq and Syria, ISIL, a report said on Wednesday.

The Daily Mail quoted a highly placed Pentagon source as saying that Ibrahim al-Rubaish, now the spiritual leader of al-Qaeda in the Arabian Peninsula (AQAP) has been recruiting for the terrorist group.

Rubaish was captured in the year of 2001by US troops and spent five years at Guantanamo before the Washington administration released him into Saudi custody.

He was let go from Guantanamo in 2006 along with 16 other prisoners, and quickly returned to al-Qaeda in the Arabian Peninsula becoming its spiritual leader and he’s now recruiting for ISIL.

The official refused to be identified because of the sensitive nature of the information, and because he is not authorized to speak to the press.

A second Pentagon official, lower-ranking but with knowledge of the Obama administration’s tactical toolbox and Middle Eastern intelligence, confirmed the first source’s account.

‘That’s correct,’ he said in a phone interview when asked if al-Rubaish was sending large numbers of extremists to join ISIL.

He said some Guantanamo detainees spend time behind razor wire building networks and strategic connections that become useful once the United States government repatriates them.

The Department of Defense wouldn’t comment on al-Rubaish’s ISIL recruiting, instead sending a generic statement recounting parts of his history.

“Ibrahim Al Rubaish arrived at Guantanamo in 2002 and was transferred in 2006,” wrote Lt. Col. Myles B. Caggins III, a U.S. Army spokesman.

“Since 2009, the Defense Department and five government departments and agencies conduct thorough security and intelligence reviews prior to transferring Guantanamo detainees; more than 90 percent of detainees transferred during the Obama administration have resumed quiet lives in various countries.”

“I can’t comment on behalf of security officials in Yemen or KSA,” he insisted.

The office of the Director of National Intelligence reported in 2013 that 171 detainees Guantanamo prisoners released during the Bush years were confirmed or suspected of having re-engaged in hostilities.