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A bouquet of flowers, left by mourners, lays near the site of Wednesday's mass shooting, in Thousand Oaks, Calif., Friday, Nov. 9, 2018. Investigators continue to work to figure out why an ex-Marine opened fire Wednesday evening inside a Southern California country music bar, killing multiple people. (AP Photo/Damian Dovarganes)

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Authorities trying to make sense of why a gunman killed 12 people at a Southern California bar are not publicly discussing what they've learned, but at least one Instagram post he made after beginning the massacre has emerged as an early focus.

By JONATHAN J. COOPER and MICHAEL BALSAMO, AP November 10, 2018