Once again, using a cell phone to film rather than to call 911 appears to be the priority of at least one witness as a gang of teens stabbed to death 14-year-old boy on a Bronx playground in what authorities say was a case of mistaken identity.

The mob of teens jumped ninth-grader Angel Mendoza at the Williamsbridge Oval Playground in Norwood late Tuesday with someone filming the incident as the boy was “pistol-whipped, beaten and repeatedly knifed,” the New York Post reported.

Police told news outlets the lengthy assault was for revenge for an earlier fight in which the teen Mendoza was not even involved.

Four teenagers — Andrew Ansah, 18, Jordan Williams, 18, and two other boys, ages 15 and 16, whose names were not released because they are minors — have been arrested and charged o

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