TUSTIN, Calif. – A young man shot a woman to death in a home early Tuesday then went on a spree of carjackings and random shootings across Orange County that left two more people dead and three others wounded before the gunman killed himself, authorities said.

Many more victims were shot at but unhurt, Tustin Lt. Paul Garaven said.

The gunman was only described as being in his 20s, and his motive was not known, according to officials of at least four agencies investigating multiple crime scenes.