On December 13, 2025, deputies from the Jurupa Valley Sheriff’s Station Special Enforcement and Problem-Oriented Policing Teams responded to information about suspected illegal activity at a residence in the 5000 block of Steve Street in Jurupa Valley. Authorities were told that an individual was allegedly using a controlled substance and manufacturing illegal firearms at the location.
Deputies obtained a search warrant for the property. During their search, they found and seized 13 firearms, including two that had been reported stolen and one short-barreled rifle. In addition, they recovered 20 3D-printed lower receivers, several suppressors and large-capacity magazines, hundreds of rounds of ammunition, as well as a small amount of methamphetamine and drug paraphernalia.
The suspect was identified as Marco Ponce de Leon, age 37, a resident of Jurupa Valley. He was arrested and booked into the Robert Presley Detention Center on multiple charges. These include being a convicted felon in possession of a firearm and ammunition, possession of an assault weapon, manufacturing an assault weapon, manufacturing unserialized firearms, along with other weapons-related offenses and drug charges.
“This is an ongoing investigation, and no further details are available. Anyone with information on this investigation can contact Deputy Alexis Sanchez of the Jurupa Valley Sheriff’s Station at (951) 955-2600.”
“The Jurupa Valley Sheriff’s Station is committed to serving the members of our community and keeping our neighborhoods safe. Community Safety is a shared responsibility, and we encourage our members to report any suspicious activity to law enforcement. By working together, we can prevent crime and help ensure a safer community for all. If you see something, say something.”
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