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

A 24-year-old man, Chad Williams, opened fire at an In-N-Out Burger in Twin Falls, Idaho, killing three people, wounding seven others, and then committing suicide. Authorities confirmed Williams acted alone, and an off-duty state trooper and civilian intervened to stop him. The attack occurred at a newly opened location in a busy shopping plaza.