World War II veteran Walter Seifert runs amok in an elementary school in Cologne, Germany, killing at least eight children and two teachers and seriously injuring several more with a home-made flamethrower and a lance.

The Cologne school massacre was a mass murder that occurred at the Catholic elementary school (German: katholische Volksschule) located in the suburb of Volkhoven in Cologne, West Germany on 11 June 1964. The perpetrator, Walter Seifert, also known as "Der Feuerteufel von Volkhoven" ("Firedevil of Volkhoven"), attacked the people at the school with a home-made flamethrower and a spear, killing eight pupils and two teachers, and wounding twenty-two others. When police arrived at the scene, he fled from the school compound and poisoned himself. He was taken to a hospital, where he died the same evening.