April 16, 2015 3:12 PM EDT

Federal charges have been filed against an Ohio man, accusing him of going to Syria to get terrorist training, then returning to the United States with the intention of killing police or soldiers.

Authorities accuse Abdirahman Sheik Mohamud, 23, of Columbus, of leaving the U.S. in April 2014 “for the purpose of training and fighting with terrorists in Syria.”

They say Mohamud, a naturalized citizen, got a passport and bought a one-way ticket to Greece. He did not take a connecting flight from Istanbul to Athens and instead “completed pre-arranged plans to travel to Syria,” they alleged.

Once there…

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