The black gunman who fatally wounded a police officer, left a suicide note before going on a shooting spree, officials have said

San Diego-based officer Jeremy Henwood was pulling away from traffic lights when Dejon Marquee White's car pulled up alongside him and he unloaded his shotgun. Following the unprovoked attack, police later cornered the armed 23-year-old and killed him. After searching his apartment, they found a two-page suicide note. Sitting alone in his car the 36-year-old policeman was attacked by White, and died in hospital. Investigators have said that they can determine no motive for the shooting of the police officer. Before the shooting White was described as a petty criminal, and he had previously resisted arrest and performed minor thefts.