The U.S. government is refusing to identify the bomber who six months ago perpetrated a deadly Islamic State suicide bombing at the airport in Kabul, Afghanistan, despite numerous reports of anonymous officials naming the attacker as Abdul Rehman al Logari.

The attacker’s alleged identity is something of an open secret in national security circles and on Capitol Hill, but the Biden administration has refused to openly confirm that Logari, who had been freed from a prison at Bagram Air Base in August of last year when the Taliban took it over, was indeed the bomber who killed and wounded 58 U.S. troops. The Aug. 26 attack killed 13 U.S. service members and nearly 200 Afghans while wounding dozens more as the United States led evacuation operations at the airport with the Taliban providing security outside.