As Santa Clarita mourned the two students killed in the shooting at Saugus High School, law enforcement authorities tried to uncover a motive for the attack and how the shooter obtained the gun he used.

Throughout the day and into Friday night, residents, students and families came together around a makeshift memorial in Central Park, a short walk from the school.

The teenager who opened fire on his classmates before shooting himself died Friday night at a hospital, authorities said. Officials said his mother was with him.

A key focus of the investigation is how Nathaniel Berhow got the .45-caliber handgun he used to carry out the attack Thursday morning[/QUOTE

Further Down:

He ( Sheriff Alex Villanueva) said investigators found several firearms during a search of the teen’s home, and some were not registered. Villanueva did not specify what types of guns were recovered.

Berhow’s late father is said to have been an avid hunter, but it’s unclear if those weapons belonged to him