BALTIMORE, MD. (THECOUNT) — Although ATF agents successfully traced the histories of six firearms found at the home of the Saugus High School shooting, they are unable to identify the weapon used in the shooting.

Investigators accounted for a number of guns once registered to the teen’s father, Mark Berhow, most of which were seized by the Sheriff’s Department several years ago following a “mental health evaluation,” say law enforcement officials.

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The guns taken from the family’s home several years ago were destroyed, the sources said. The seizure followed an incident which led to the father undergoing a mental health evaluation, reported KNBC Friday night.

Officials said there were also weapons that were not registered to the father. “Some of the firearms were not registered at all.” Officials offered no further explanation.

Law enforcement sources familiar with the investigation said Thursday guns and gun parts were found in several different areas of the home. A box truck was brought to the home by LA County Sheriff’s deputies to transport the weapons and other evidence.

Dominic Blackwell, 14, was identified as one of the students killed according to family members. Gracie Anne Muehlberger, 15, was identified by the Los Angeles County coroner’s office as one of the two students who were shot and killed by a classmate at Saugus High School in an incident that left several others injured.

Nathaniel “Nate” Berhow, 16 to the day, died of self-inflicted injuries, say multiple Friday reports.

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Geo quick facts: Santa Clarita is a California city north of Los Angeles. It’s known for the Six Flags Magic Mountain theme park, with many roller coasters. The adjacent Six Flags Hurricane Harbor is a summertime water park with tall slides and a wave pool. The prehistoric stone formations of Vasquez Rocks Natural Area Park have served as a backdrop for many films. William S. Hart Park has a museum dedicated to the silent-film star – wikipedia.