In-N-Out shooting: Police release chilling surveillance video from chaotic scene

Three people were killed and seven were wounded in Saturday's shooting.

Police said Friday there's no known motive in the deadly mass shooting at an In-N-Out Burger in Twin Falls, Idaho, as they released chilling video footage from the chaotic shooting scene.

Chad Williams, 24, allegedly opened fire at the In-N-Out on Aug. 1, police said, killing three people and wounding seven.

At a news conference, Twin Falls police released dramatic surveillance video that showed terrified employees diving for cover and shielding one another.

The video shows the moment the carnage began, when the gunman drove up to the drive-thru payment window and fatally shot the first victim, In-N-Out employee Ashley Garibay, according to police.

The gunman then parked his car and shot another victim who was in his car, police said.

Later, the video shows the gunman looking through the payment window and seeing employees rendering aid to Garibay, according to police narration of the video.

The gunman was then seen firing into the payment window, according to police, and when his handgun jammed, he went to his car to get a rifle.

The video showed the chaos inside the restaurant as an off-duty trooper searched for the gunman and helped usher people to the exit, police said.

The gunman is then seen on video running back to the drive-thru with the rifle and later firing at customers, according to police.

Later on, video captured a Good Samaritan with a handgun engaging the suspect in the parking lot as the gunman continued to fire, police said.

The off-duty officer and the Good Samaritan both confronted the suspect, which police said helped stop the shooting.

Williams -- who police believe acted alone -- died from a self-inflicted gunshot wound, officials said.

The slain victims were identified by police as Garibay, 23; Dale Schultz, 66; and Christopher Claunch, 59.

Twin Falls Police Chief Matthew Hicks said the first officer was on the scene within three minutes of the call, but it took about 90 minutes "to determine there was only one shooter involved."

"During those 90 minutes, officers received multiple reports of possible active shooters in different locations. There were reports of suspects headed toward the mall, which required officers to divert their attention and resources to respond there," Hicks said.