woman walks past a memorial of flowers in front of the Oakland police station in Oakland, California March 22, 2009. A man killed three police officers and critically wounded another on Saturday in two separate shootings that began with a traffic stop and ended with a gun battle, police said. A police officer involved in Saturday's gun shootings in U.S. west coast city Oakland who was previously declared dead Sunday is actually "brain dead," local media reported. [Xinhua/Reuters]