On Wednesday it came to light that the Islamic State jihadi who murdered 13 American service members and numerous Afghans as well in a suicide bombing at the Kabul airport in August had just been released from prison at Bagram Air Base, the center of American operations in Afghanistan until the U.S. abandoned it in July.

CNN reported that the bomber, Abdul Rehman Al-Loghri, was part of “ISIS-K,” that is, the Islamic State’s Khorasan group in central Asia and that he had “been released from a prison near Kabul just days earlier when the Taliban took control of the area, according to three US officials.”

Al-Loghri held been held in the Parwan prison at Bagram Air Base, along with around 5,000 other prisoners, including several hundred members of ISIS, as well as Taliban and al-Qaeda jihadis.

Back in July, according to the Associated Press, “the U.S. left Afghanistan’s Bagram Airfield after nearly 20 years by shutting off the electricity and slipping away in the night without notifying the base’s new Afghan commander, who discovered the Americans’ departure more than two hours after they left.”

When the Taliban rolled into Kabul, they entered Bagram without encountering any significant opposition and opened the gates of the Parwan prison. Al-Loghri and many other jihadis walked free.

Then on August 26, al-Loghri blew himself up at the Kabul airport, murdering eleven Marines, as well as one member of the Army and one of the Navy.