Authorities in the western U.S. state of California say a heavily armed gunman killed at least four people Friday in the city of Santa Monica before he was shot dead by police in the library of a local college.
Santa Monica Police Sergeant Richard Lewis revised the death toll in a news conference late Friday. Police had previously said the shooter killed six people.
Lewis said hospital workers are treating one injured person who remains in critical condition. Another person is in serious but stable condition, while three others sustained minor injuries.
The shooting rampage started at a house where two people were found dead near Santa Monica Community College. The spree continued as the gunman, dressed in black, made his way toward the campus and killed two others.
Authorities have not identified the shooter, or given a possible motive for the deadly incident.
Police say the shooter used an "assault-type rifle" and at least one handgun.
Police have released a person who was taken into custody for questioning after determining he was not a suspect in the case.
U.S. President Barack Obama was attending a fundraising event in Santa Monica about the time of the shootings. But the U.S. Secret Service, which guards the president, described the shootings as a local police matter and said the violence had not had an impact on the president's visit.