That’s what the Chicago Tribune says:
Bail was set at $1 million Tuesday for a Addison man after Elgin Police, assisting agents from Immigration and Customs Enforcement and Homeland Security Investigations, served a search warrant on a storage unit in Elgin and found a large cache of weapons that included fully automatic firearms and hand grenades, officials said.
. . .
Officers in the Elgin Police Department’s Special Investigations Division and federal agents identified the unit’s renter Juan Mexicano, 31, of Addison, who was taken into custody without incident, according to police.
Maybe that’s just his stage name.