NEW: Harrowing video shows an exchange of gunfire outside an Idaho In-N-Out Burger where a mass shooting left three people dead and seven others wounded. The m

NEW: Harrowing video shows an exchange of gunfire outside an Idaho In-N-Out Burger where a mass shooting left three people dead and seven others wounded. The man who recorded the footage says he was stopped at a traffic light when he saw an individual firing into a vehicle just a few feet in front …