Southern California investigators say a man opened fire on a woman and her 12-year-old son in a Mercedes after the boy pointed and laughed at the man's feet hanging out the window of a moving Cadillac.

The shooting Wednesday occurred in front of a Hawthorne police cruiser, prompting officers to shoot the gunman.

The gunman and the woman, 36-year-old Denise Berry, were killed and the boy was wounded.

The Los Angeles Times reports Friday (http://lat.ms/1BYiuBl ) that police pieced together the events based on statements by the boy, who was hospitalized in stable condition.

The shooter has been identified as 38-year-old Robert Washington.

Two men in the Cadillac, ages 24 and 19, were arrested. It's unclear what charges, if any, they may face.

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Information from: Los Angeles Times, http://www.latimes.com/