Using more than a dozen videos related to the shooting of Alex Pretti, The Times worked to establish what is called ground truth: what happened, how it happened and who might be responsible.

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In total, 10 shots were fired in less than five seconds, according to a forensic audio analysis of the videos conducted for ABC News.

In a statement on Saturday, the DHS said a suspect approached U.S. Border Patrol officers with a 9 mm semi-automatic handgun.

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