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The FBI’s counterterrorism team blocked Yousef Mohammad Ramadan, 28, of Ypsilanti from flying to the Middle East and arrested him Friday, The Detroit News reports.

The arrest came after agents discovered weapons in a storage unit. He has been charged with knowingly possessing a firearm with an obliterated serial number, a five-year felony.

A detention hearing is Tuesday in U.S. District Court in Detroit. 

Robert Snell reports: 

Yousef Mohammad Ramadan, 28, has not been charged with a terror-related crime and an FBI spokesman declined to comment, leaving it unclear why the FBI’s counterterrorism team and the head of the U.S. Attorney’s Office’s national security unit are involved in the case, whether investigators had thwarted a terror attack or stopped a man from traveling overseas to commit terror.

The case is shrouded in secrecy. The U.S. Attorney’s Office quietly brought Ramadan into federal court Saturday for a rare weekend arraignment when federal court was closed to the public. The arraignment, which was not posted on the court’s calendar, ended with a federal magistrate judge ordering Ramadan be held temporarily without bond.

Read more: The Detroit News