Luigi Mangione was arrested in Altoona, Pennsylvania, after giving police officers a fake ID, according to court documents.

Officers say they found a 3D-printed pistol and a silencer in Mangione’s backpack.

Mangione is now facing charges for: Firearms not to be carried without a license, posessing instruments of crime, providing false identification to law enforcement, tampering with records or identification and forgery.

[Read Luigi Mangione’s arrest warrant for second-degree murder (PDF)]