Newly surfaced video shows confessed Florida school shooter Nikolas Cruz brawling with fellow students at the high school where authorities say he massacred 17 people over a year later.

In the blurry cellphone footage from September 2016 obtained by ABC station WPLG, Cruz, wearing khakis, a white short-sleeve T-shirt and a dark bandanna around his neck, flails as he tussles with a group of other students in an outdoor courtyard at Marjory Stoneman Douglas High School.