A gunman choosing targets at random opened fire in a rural Northern California town Tuesday, killing four people at several sites and wounding others at an elementary school before police shot him dead, authorities said. A witness says he and his roommates had sounded the alarm on the shooter to police several times. His roommate is now among the dead. At this time, Tehama County Assistant Sheriff Phil Johnston says a motive is not yet known and that the victims of the shooting appeared to be "random selections.”