Serbians are reeling and demanding answers after two mass shootings in less than 48 hours left multiple people dead, with widespread calls for tough action to prevent any further repeat of such tragedies. The night before the killings at the Belgrade elementary, the 13-year-old suspect was up late watching videos on TikTok and an American documentary about a school shooting, according to Belgrade police chief Veselin Milić, who declined to name the specific film. A blood donation clinic close to the school in central Belgrade said it had twice as many donors as usual turn up to give blood following the shooting