An alleged Islamic State group militant from Afghanistan was convicted on Wednesday of aiding the terror organization that took credit for a deadly suicide bombing at a Kabul airport, but a jury couldn’t agree on whether he bears some responsibility for that attack during the U.S. military’s chaotic withdrawal from the country in 2021.

Mohammad Sharifullah faces a maximum prison sentence of 20 years after his one-count conviction in an international terrorism case that President Donald Trump heralded last year during a speech to a joint session of Congress. Sharifullah didn’t testify at his weeklong trial.

Approximately 160 Afghans and 13 U.S. service members were killed in the Aug. 26, 2021, attack at the airport, where U.S. troops were conducting an evacuation operation when a lone suicide bomber detonated an improvised explosive device near an entry point known as Abbey Gate.

A federal jury in Virginia convicted Sharifullah of providing material support to an Islamic State regional branch known as ISIS-K. But the jurors deadlocked on whether any deaths at the airport “resulted from” that conspiracy. Sharifullah could have faced a possible life sentence if the jury had unanimously decided that question.

Sharifullah didn’t appear to have any visible reaction to the verdict. U.S. District Judge Anthony Trenga didn’t immediately set a date for Sharifullah’s sentencing.

The jury deliberated for roughly eight hours over two days. In a note to the judge, jurors indicated that they quickly reached a unanimous decision to convict Sharifullah of conspiracy but couldn’t agree on the element that could have significantly enhanced the severity of his sentence. The judge rejected a prosecutor’s request to give them more time to deliberate.

Defense attorney Lauren Rosen argued that prosecutors failed to present any evidence tying Sharifullah to the bombing besides his own words during hours of FBI questioning. Rosen said Sharifullah told FBI agents what he thought they wanted to hear, possibly because he was afraid of being tortured in Pakistani custody before he was brought to the U.S.

“The problem was, he didn’t know much about what actually happened that day,” Rosen told jurors during the trial’s closing arguments. “The government has told you nothing about how this attack actually happened.”

Justice Department prosecutor Ryan White said Sharifullah played a crucial role in planning the Abbey Gate bombing and was involved in several other attacks by ISIS-K, including its March 2024 attack at a Moscow concert hall that killed roughly 140 people.

“The defendant thought nothing of killing,” White said. “For him, it was just another day at the office.”

A review by U.S. Central Command found that the Abbey Gate bomber was Abdul Rahman al-Logari, an Islamic State group militant who had been released from an Afghan prison by the Taliban. Sharifullah recognized the alleged bomber as an operative he had known while incarcerated, according to an FBI affidavit.

A former Marine testified to Congress that he and others had spotted two possible suspects behaving suspiciously on the morning of the bombing but didn’t get permission to act. However, the Central Command review concluded that the snipers hadn’t seen the actual bomber and that the attack was not preventable.

A prosecutor assigned to the Abbey Gate case was fired last year after a right-wing commentator publicly criticized him over his work during President Joe Biden’s Democratic administration. Michael Ben’Ary’s ouster was part of a broader purge of Justice Department veterans deemed to be insufficiently loyal to Trump, a Republican.

During his most recent presidential campaign, Trump repeatedly condemned Biden for his role in the chaotic Afghanistan withdrawal and blamed him for the Abbey Gate attack.

Biden’s White House was following a withdrawal commitment and timeline that the first Trump administration had negotiated with the Taliban in 2020. A 2022 review by a government-appointed special investigator concluded decisions made by both Trump and Biden were the key factors leading to the rapid collapse of Afghanistan’s military and the Taliban takeover.

White, the prosecutor, said Sharifullah told a journalist that he wanted to “catch and kill the crusaders” from the U.S. for invading his country after the Sept. 11, 2001, attacks.

“This case is not complicated,” White said. “The defendant told you everything you need to know.”

Rosen said U.S. authorities accepted ISIS propaganda at face value when the group took responsibility for the airport bombing. She suggested that militants from a Taliban offshoot were manning Abbey Gate and could have been involved in the attack.

“You can’t base your verdict on mere conjecture and speculation,” Rosen said. “That’s what the prosecution is asking you to do.”