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The ISIS-K suicide bomber who killed 13 U.S. service members outside of Hamid Karzai International Airport in August was a prisoner released from Bagram Air Base on Aug. 15 after the Taliban seized control of the facility.

Officials confirmed the details to Fox News, including Rep. Ken Calvert, R-Calif., the top Republican on the House Appropriations Subcommittee on Defense, who told Fox News last week that intelligence sources reported that the suicide bomber was one of the 7,000 prisoners housed at Bagram prison, and released by the Taliban last month. 

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"Security officials have now confirmed to me that the Aug. 26 Kabul bomber was a known ISIS-K terrorist that was previously detained at the Bagram prison and was released along with thousands of others just days before the deadly attack," Calvert said, referring to the suicide bombing attack that killed 13 U.S. service members, severely injured 20 more, and left more than 150 Afghans dead.

"There were 7,000 prisoners housed there – terrorists, the worst of the terrorists – held separately from other terrorists," Calvert said. "We believe he was one of them." 

Calvert said he is "in a position," as the top Republican on the committee "that funds the CIA, NSA, NRO, U.S. Marine Corps, Army, Navy, the entire enterprise," to say that he believes the intelligence he received is "credible." 

"It is my belief that the Indian intelligence services are correct in their assumptions, and I have good reason to believe that the intelligence is correct in their assessment," he said. 

Smoke rises from explosion outside the airport in Kabul, Afghanistan, Thursday, Aug. 26, 2021. The explosion went off outside Kabul’s airport, where thousands of people have flocked as they try to flee the Taliban takeover of Afghanistan. Officials offered no casualty count, but a witness said several people appeared to have been killed or wounded Thursday. (AP Photo/Wali Sabawoon)

Smoke rises from explosion outside the airport in Kabul, Afghanistan, Thursday, Aug. 26, 2021. The explosion went off outside Kabul’s airport, where thousands of people have flocked as they try to flee the Taliban takeover of Afghanistan. Officials offered no casualty count, but a witness said several people appeared to have been killed or wounded Thursday. (AP Photo/Wali Sabawoon) (AP Photo/Wali Sabawoon)

"This is obviously a big deal, and the administration is trying to avoid it right now," Calvert said. "It is important for the American people to know the truth." 

Calvert’s comments came after Defense Secretary Lloyd Austin, Chairman of the Joint Chiefs of Staff Gen. Mark Milley, and head of U.S. Central Command Gen. Kenneth F. McKenzie testified last week before the Armed Services Committees for both the House and Senate.

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McKenzie testified last week that the U.S. is "still waiting to find out" if the bomber was a former prisoner at Bagram Air Base, while Austin was largely mum on the question. 

The Aug. 26 suicide bombing took the lives of 13 U.S. service members – including 11 Marines, one Navy sailor and one Army soldier. Eighteen other U.S. service members were wounded. The bombing also left more than 150 civilians dead.

All U.S. forces were removed from Bagram, the largest military base in Afghanistan, in July. 

The Pentagon said on Aug. 27 "thousands" of ISIS-K prisoners were freed by the Taliban during their takeover of Afghanistan in the days leading up to the bombing near the Kabul airport. 

As the Biden administration began the withdrawal of military assets, provincial capitals across Afghanistan began to fall to the Taliban. By mid-August, the Taliban attained control of two-thirds of Afghanistan. And by the time the U.S. withdrew all U.S. troops from the country on Aug. 31, Kabul had also fallen to the Taliban. In mid-August, U.S. intelligence assessments projected the capital city could fall to the Taliban within 90 days. 

Meanwhile, Calvert told Fox News last week that he is investigating the matter, saying he has "a lot of questions I’m trying to get to." 

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"Why didn’t we move or secure those prisoners in the first place? And who is going to take responsibility for this miscalculation?" he asked, adding, "What are we doing to hunt down his accomplices?" 

Calvert said the individual "hit the airport 10 days after he was released" from Bagram prison and questioned whether he acted alone. 

"We need to know who they were, and also, where are the other 6,999 prisoners released?" Calvert continued. "These prisoners were not just from Afghanistan, but from a lot of different places – God knows where they’re at right now." 

He added: "We have to endeavor to find out what that means to the threat to our homeland and to our allies with these terrorists set free."

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Calvert said the U.S., following the full withdrawal of military assets from Afghanistan, is "in a bad situation." 

"You have thousands of these terrorists running around," he said, adding that the release of prisoners from Bagram "has undone decades of U.S. counterterrorism work." 

"It is a threat, and it could be a major threat," he said. "The administration might as well come out and tell the truth."