WATCH: Heavy police presence in Dubona after Serbia's second mass shooting in two days
It was the second such mass killing in Serbia in two days.
The attacker shot randomly at people near the town of Mladenovac, some 50 kilometres south of Serbia's capital Belgrade.
This shooting came a day after a 13-year-old boy brought his father’s guns into a Belgrade school and killed eight fellow students and a school guard.
The bloodshed sent shockwaves through a Balkan nation unused to mass murders.