Investigators are trying to determine what led a 24-year-old man to open fire at an Idaho fast-food restaurant over the weekend, in an attack that left three people dead and seven others wounded before authorities say he killed himself

The owner of a fast-food restaurant chain says one of her workers was among three people killed in a shooting in southern Idaho The shooting happened Saturday at an In-N-Out Burger in Twin Falls, Idaho

Authorities in southern Idaho say a shooting at an In-N-Out Burger restaurant has resulted in multiple people dead and others injured