1965 Highway 101 sniper attack
Early on the Sunday morning of April 25, 1965, 16-year-old Michael Andrew Clark opened fire on cars traveling along U.S. Highway 101 just south of Orcutt, California, United States, from a nearby hilltop. Three people were killed and ten were wounded before Clark committed suicide upon arrival of police.
Source: Wikipedia — 1965 Highway 101 sniper attack (CC BY-SA 4.0)