A gunman opened fire at an In-N-Out in Twin Falls, Idaho, killing several people before turning the gun on himself — a tragedy, though armed citizens appear to have kept the death toll from climbing higher.

• The attacker shot people in the drive-through, chased victims through the parking lot, fired at passing cars, and killed two people sitting in Teslas at a charging station.
• An on-duty state trooper who ran toward the scene was shot; several off-duty officers and armed civilians engaged the gunman during the attack.
• His gun jammed at one point, and a fleeing woman grabbed the weapon he dropped — interruptions from armed bystanders repeatedly stopped him from shooting more people.
• Idaho has among the highest concealed-carry rates in the country, and the case is fueling a gun-rights argument that armed citizens saved lives before police arrived.
• When police finally surrounded him near a nearby trail, he shot himself; little is known yet about who he was or why he did it.

Outlook: Investigators are still digging into the gunman's background, mental health, and motive, with more details expected in the coming days.