A gunman has killed three people before taking his own life in a 25-minute shooting spree in California.
The violence started when the gunman - named by police as 20-year-old Ali Syed, an unemployed student - shot dead a woman in her 20s at her home in Ladera Ranch in the early hours of Tuesday.
He then headed north and hijacked a Dodge pickup truck in Tustin, around 40 miles southeast of Los Angeles. The driver was unhurt but a bystander was hit by gunfire and taken to hospital.
When the truck ran out of fuel, Syed stole a BMW and killed the driver, Santa Ana Police Corporal Anthony Bertagna said.
He then drove to a local business and took another small truck, killing one person and wounding another, Lieutenant Paul Garaven, of Tustin Police Department, told reporters.
Police officers followed the gunman to Orange, a city about five miles away.
As they approached Syed at a busy intersection, he got out of the vehicle and shot himself.
Police do not yet have a motive for the shootings, which came less than two weeks after former Los Angeles police officer Christopher Dorner went on the run after allegedly killing three people .
His charred remains were found inside a burned-out California mountain cabin .