WATCH: Video from the scene of the Cali. bar shooting

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NBC News (NBC) - WATCH - this video was provided by "OnScene.TV" showing the scene of a mass shooting at the Borderline Bar and Grill in Thousand Oaks, California.

A hooded gunman dressed entirely in black opened fire on a crowd at a country dance bar holding a weekly "college night" in Southern California, killing 12 people and sending hundreds fleeing including some who used barstools to break windows and escape, authorities said Thursday. The gunman was later found dead at the scene.