Alexanda Amon Kotey (left) and El Shafee Elsheikh, who were allegedly among four British jihadis who made up a brutal Islamic State cell dubbed “The Beatles,” speak during an interview with The Associated Press at a security center in Kobani, Syria, in March 2018.

Hussein Malla/AP

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Hussein Malla/AP

Alexanda Amon Kotey (left) and El Shafee Elsheikh, who were allegedly among four British jihadis who made up a brutal Islamic State cell dubbed “The Beatles,” speak during an interview with The Associated Press at a security center in Kobani, Syria, in March 2018.

Hussein Malla/AP

The Justice Department is expected to announce charges this week against two British nationals suspected of being part of a notorious Islamic State cell accused of torturing and beheading Western hostages, according to a law enforcement official.

The two men, Alexanda Kotey and El Shafee Elsheikh, were captured by U.S. Kurdish allies in Syria in 2018, and transferred to American military custody in Iraq. They are expected to arrive in the United States in the near future, setting the stage for one of the biggest terrorism trials in the country in recent years.

NBC News first reported their expected transfer to the U.S.

Kotey and Elsheikh are believed to be one half of a cell of Islamic State militants in Syria nicknamed “The Beatles” because of their British accents. The cell became notorious in 2014 for their brutal treatment of hostages, including on-camera beheadings that the group posted videos of online.

It was not immediately clear what specific charges Kotey and Elsheikh will face, but the U.S. government has accused “The Beatles” of killing more than 27 people, including two American journalists, James Foley and Steven Sotloff, American aid worker Peter Kassig, as well as British and Japanese reporters and aid workers.

The atrocities became a hallmark of Islamic State, which routinely slaughtered Syrian and Iraqi prisoners and civilians.

Out of legal limbo

The decision to bring Kotey and Elsheikh to the U.S. and put them on trial brings an end to the legal limbo they have been in since their capture.

The U.S. made its first request in 2015 to the British government for evidence that the UK had collected in its own investigation of Kotey, Elsheikh and others. Britain, which had stripped the men of their citizenship, had concerns about handing the materials over to the U.S. because the Justice Department could pursue the death penalty against the men.

In 2018, the British government relented after deciding that having Kotey and Elsheikh stand trial in the U.S. was the best approach. It agreed to transfer the evidence without a guarantee from Washington not to seek the death penalty.

But that move was put on hold after Elsheikh’s mother filed a lawsuit in the UK challenging the decision.

In August, Attorney General William Barr provided the British government assurances that the United States would not seek to execute the men, if they were tried and convicted. He also warned that the U.S. would hand Kotey and Elsheikh to Iraqi authorities for prosecution if the British government failed to resolve the issue by Oct. 15.

Late last month, a UK court cleared the way for the two men to be tried in the U.S., and the British authorities handed over the evidence Washington had requested more than five years ago.

That was the final piece U.S. prosecutors needed for their case against Kotey and Elsheikh, and the Justice Department is expected announce criminal charges against the duo this week, the law enforcement official told NPR on condition of anonymity.

NBC News first reported their expected transfer to the U.S.

The rise of the Islamic State

Islamic State had been a growing power in Syria and Iraq when it finally burst into the American public’s consciousness in June 2014 with its takeover of the city of Mosul in northern Iraq.

With the fall of Mosul, the militants turned their sights on Baghdad.

At the time, it was unclear whether the Iraqi government could withstand the onslaught, and the United States scrambled to try to shore up its Iraqi allies. In early August 2014, the Obama administration began conducting airstrikes against the terrorist group in Iraq.

Just over a week later, Islamic State posted a graphic video online showing Foley’s murder. Foley had been taken captive in Syria in 2012 by extremists and was held hostage with other Westerners by Islamic State.

The group released a second video less than a month after Foley’s murder showing the killing of another American journalist, Steven Sotloff. A third American, aid worker Peter Kassig, was killed a few months later.

They were among a series of other gruesome videos that featured a masked man dressed in black who spoke to the camera in a British accent. The Western press often referred to the man as “Jihadi John,” who was later identified as the cell’s ringleader, Mohammed Emwazi.

A fourth American, Kayla Mueller, was also held hostage by Islamic State. She was repeatedly raped by the group’s leader, Abu Bakr al-Baghdadi. Mueller was killed in 2015.

Eventually, the tide of the fight against Islamic State shifted and the militants suffered a string of setbacks.

Emwazi was killed in a U.S. drone strike in 2015. That same year, another member of the cell, Aine Davis, was captured in Turkey. He was tried and convicted in a Turkish court and sentenced to seven years in prison.

Now, the two remaining members of the group, Kotey and Elsheikh, are to face justice in the U.S.

In an op-ed published this summer in the Washington Post, the families of the group’s American victims urged the U.S. government to bring the two men to the United States to face trial.

Kotey and Elsheikh have admitted they belonged to Islamic State but have denied a role in any killings. In an interview with the Washington Post, they said they facilitated ransom negotiations with the hostages’ families and the respective governments.

Islamic State released several European hostages in exchange for ransom, but none of the Americans.

In 2015, then-President Barack Obama announced changes to U.S. hostage policy after the American hostages’ families expressed frustration and outrage with how the government had handled the situation.