The conditions of the wounded victims were unknown.
It is possible more people were shot at because some people may have chased the shooter, Kanoti said.
A spokeswoman for the California Highway Patrol said they didn’t have any active crime scenes on the freeway but the southbound 55 McFadden Avenue off-ramp would be closed until further notice.
Kanoti said authorities were trying to figure out if the spree started with the fatal carjacking but could not yet confirm that.
Tustin is about 35 miles southeast of downtown Los Angeles.