Abdirahman Sheik Mohamud, a US citizen originally from Somalia, wanted to "kill three or four American soldiers execution style," according to the indictment. Attacking the prison was part of a backup plan if that didn't work, the charges said yesterday.
The indictment also says Mohamud's brother, Abdifatah Aden, fought with Jabhat al-Nusrah, a State Department-designated terrorist group, until he was killed in battle in Syria in June 2014.
The government charged Mohamud under the laws most commonly used since the September 11 attacks to prosecute terror suspects. He faces up to 38 years in prison if convicted.
Mohamud was arrested in Columbus in February on state terrorism and money laundering counts. Thursday's charges were expected, and Mohamud will plead not guilty at a Friday arraignment, said his attorney, Sam Shamansky. He said it was too early to talk about the specific charges.
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The government didn't say how it learned of the plot, but the indictment mentions two "unnamed" associates of Mohamud in the US to whom he gave information about his activities, including a video of Mohamud carrying an AK-47.
One of them said he believed Mohamud was trying to recruit him to participate in the plot, according to the indictment. The government also said Mohamud made terrorism-related Facebook posts in 2013.
US Representative Michael McCaul, chairman of the Committee on Homeland Security, said the charges highlight the threat posed by Americans joining extremists overseas then returning home.
Mohamud told his brother of his desire to "join you in the high ranks as a Mujahid," or violent jihadist, according to the indictment.