BISMARCK, N.D. (AP) — Body camera footage of a shooting ambush last month in Fargo shows the surprise nature of the chaotic attack that left one police officer dead and two others and a bystander wounded, as the only officer left standing called for help and engaged the heavily armed shooter in a barrage of gunfire along a busy street.

North Dakota Attorney General Drew Wrigley and Fargo Police Chief David Zibolski on Thursday presented the July 14 video footage taken from Officer Zach Robinson’s body camera of the attack that left North Dakota’s biggest city shocked at the unusual violence.

Clearly audible in the footage is gunman Mohamad Barakat’s rapid fire from a .223-caliber rifle, modified with a binary trigger, that took down the three officers before a breathless Robinson stopped him after a nearly 2-minute confrontation.

The video also illustrates what authorities have said was likely part of a planned, larger attack, with an arsenal of guns and explosives found in Barakat’s vehicle.