The 26-year-old is accused of fatally gunning down UnitedHealthcare CEO Brian Thompson

Mangione is accused of killing Brian Thompson on Dec. 4.

The man suspected of killing Brian Thompson is being held in Pennsylvania on weapons charges

The man was allegedly in possession of a false N.J. ID and a gun similar to that used by the shooter, police sources tell PEOPLE

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The suspect was detained in Altoona, Pa., after customers at a McDonald's called authorities

The man was allegedly in possession of a false N.J. ID and a gun similar to that used by the shooter, police sources tell PEOPLE

The man is believed to possess the same gun used by the shooter of Brian Thompson