A gunman apparently shooting at random killed eight people and wounded 14 in three Serbian villages, authorities said, shaking a nation still in the throes of grief over a mass shooting a day earlier. Police arrested a suspect on Friday after an all-night manhunt.
Serbian President Aleksandar Vucic called on Thursday's shooting an attack on the whole nation.
It came a day after a 13-year-old boy used his father's guns to kill eight fellow students and a guard at a school in Belgrade, the capital.
The bloodshed sent shockwaves through a Balkan nation scarred by wars, but unused to mass murders. Though Serbia is awash with weapons left over from the wars of the 1990s, Wednesday's shooting was the first at a school in the country's modern history.
The last mass shooting before this week was in 2013 when a war veteran killed 13 people in a central Serbian village.