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The Orlando Police Department released this photo of Omar Mateen, the person identified as the shooter in the Orlando terror attack.
The Orlando Police Department released this photo of Omar Mateen, the person identified as the shooter in the Orlando terror attack.

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    Investigators look into the past of Omar Mateen

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Investigators look into the past of Omar Mateen

Investigators are working to figure out why Omar Mateen carried out the deadliest mass shooting in U.S. history. CNN's Drew Griffin reports.

Investigators look into the past of Omar Mateen

Investigators are working to figure out why Omar Mateen carried out the deadliest mass shooting in U.S. history. CNN's Drew Griffin reports.