Another Wild Shooting in California

So.......why shoot at an apparently random ambulance?  Police car? Two other vehicles?  How crazy is this.........and where did the gun(s) come from for this incident?  Either someone obtained a legal gun who shouldn't have; OR, someone did not properly secure their weapons from criminals.

San Diego gunman goes on freeway shooting spree

He opens fire on an ambulance, a police car and at least two other vehicles

updated 1 hour 25 minutes ago

LOS ANGELES — Authorities searched for a gunman who opened fire from a speeding car on Monday at an ambulance, a police car and at least two other vehicles along a San Diego freeway, the California Highway Patrol said.

One man was struck in the leg by gunfire in the late-morning shootings, which prompted the Highway Patrol to close northbound lanes on a stretch of Interstate 805, but his wounds were not believed to be life-threatening, police said.
"The ambulance took some rounds," Highway Patrol spokesman Larry Landeros said, "but nobody was hit."
The suspect was seen firing shots out of a moving Chevy Malibu sedan with California license plates, and there were reports of such shootings at four different locations, Landeros said.
In addition to the ambulance, a Highway Patrol car also was targeted, police said.