Authorities seek a motive in mass shooting at an Idaho In-N-Out Burger

Investigators are working to determine the motive behind a weekend mass shooting at an In-N-Out Burger in Twin Falls, Idaho, which resulted in three deaths and seven injuries. The suspected gunman, 24-year-old Chad Williams, died by suicide following the attack on Saturday. Police Chief Matthew Hicks confirmed that detectives believe Williams acted alone and that his family is cooperating with the investigation.

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Detectives are confident that the gunman, identified as Chad Williams, acted alone in the shooting Saturday at an In-N-Out Burger in Twin Falls.

An off-duty state trooper and a civilian engaged the shooter, diverting him and likely preventing more casualties. Authorities have not yet released the names of the victims or the intervening officers. While two wounded individuals were treated and released, three others remain in stable condition, and two are in critical condition.

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An off-duty state trooper and a civilian fired on the attacker and diverted him from the restaurant.

An employee of the In-N-Out Burger, which recently opened as part of the chain's expansion into Idaho, was among those killed. The restaurant is located in a busy shopping plaza, and hundreds of people were in the vicinity when the shooting occurred. Witnesses described seeing a man with a rifle emerge from the drive-thru, followed by gunfire. One witness recounted seeing an employee in uniform drag another injured employee, who was bleeding from a chest wound, across the parking lot.

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An In-N-Out employee was among those killed.