California police spend the day retracing Santa Monica College shooters footsteps and interviewing witnesses

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CALIFORNIA (CNN)– Authorities spent Saturday at multiple crime scenes.

From retracing the Santa Monica gunman’s steps from a raging home fire, where the shooter’s father and son are believed to have been killed, to a carjacking and shootings on the streets and at a bus, to his deadly end at Santa Monica College.

Amidst the carnage there were possible clues to what set off the gunman, who wore all black clothes and tactical gear.

A law enforcement source says he suffered from mental health issues.

Witnesses recounted their terror and described the assault-style toting gunman who carried an assault-style rifle, as being eerily calm and methodical in looking for targets.

He wasn’t raging. He wasn’t in a chaotic state at all.

It was really bizarre he was very calm, not running around, not yelling. Just looking around for targets very casually

One of the victims, driving this red SUV was identified as a 68-year old groundskeeper at the college; his daughter a college student in the car with him was injured.