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Audio of gunfire in Michael Brown case authenticated by app company

An audio recording that captures the shooting death of Michael Brown has been authenticated by the app company it was recorded on.

Men walk past a makeshift memorial near the site where unarmed teen Michael Brown was shot dead in Ferguson
Men walk past a makeshift memorial near the site where unarmed teen Michael Brown was shot dead in Ferguson, Mo. on Aug. 22, 2014.REUTERS

Trymaine Lee

Trymaine Lee is an NBC News correspondent.