Serbian Education Minister Branko Ruzic resigned Sunday, May 7, four days after a school shooting in which a 13-year-old boy murdered eight students and a security guard.

Branko Ruzic offered his condolences to the families of the victims of a “cataclysmic tragedy” that shocked the Balkan nation in an open letter to Serbian Prime Minister Ana Brnabic. “I submit my irrevocable resignation from the post of Minister of Education in the Government of the Republic of Serbia,” Ruzic wrote in a letter he shared on Twitter.

“Western Values”

A prominent member of the Socialist Party of Serbia (SDP), a ruling coalition partner, he blamed the internet, video games and “Western values” for the unprecedented killing in Serbia. Opposition parties and human rights groups immediately after the tragedy called for his resignation.

Less than 48 hours after that shooting, Serbia was shocked by yet another killing spree when a 21-year-old man shot dead eight people near Belgrade with automatic weapons.

Serbian President Aleksandar Vucic has promised to launch a full-scale disarmament plan. In Serbia, 39% of residents own a gun, the highest rate in Europe for civilian gun ownership, according to the Small Arms Survey (SAS) research project.