A seven-year-old child was killed by a knife-wielding assailant who attacked a teacher and pupils at a Zagreb primary school on Friday.
Health Minister Irena Hrstic said the attacker stabbed five people, wounding four and killing one. The suspect later injured himself and was detained.
"Five persons have been hospitalised and their lives are not in danger," Hrstic told reporters. They included the suspected attacker.
Interior Minister Davor Bozinovic said the attacker was a 19-year-old former school student, who entered the school in the middle of the morning and wounded the teacher and children with a knife.
"He ran away from the crime site and shut himself in a nearby health centre where he tried to injure himself with the knife," Bozinovic told reporters.
Bozinovic said the suspect had a history of psychological problems and had tried to commit suicide last year.
Zagreb Mayor Tomislav Tomašević proclaimed the Day of Mourning on Friday.
"We are horrified," Prime Minister Andrej Plenkovic said.
France, Spain, Bahrain, and India have condemned the Iranian attack that targeted Qatar's Ras Laffan Industrial City during separate phone calls with Qatar's Emir Sheikh Tamim bin Hamad Al Thani.
Iran no longer has the capacity to enrich uranium or make ballistic missiles after 20 days of US-Israeli air attacks, Israeli Prime Minister Benjamin Netanyahu told a news conference on Thursday.
The US objectives in its war against Iran have not changed since strikes started on February 28, Defence Secretary Pete Hegseth said on Thursday, and he accused the media of stirring up concerns that the country risked being locked in an open-ended conflict with shifting priorities.
US President Donald Trump said an angry Israel "violently lashed out" and attacked Iran's major gas field, a significant escalation in the US-Israeli war, but ruled out further such attacks by Israel unless Iran retaliated further.
US President Donald Trump greeted Japan's Prime Minister Sanae Takaichi warmly at the White House on Thursday and said he believed Japan was "really stepping up to the plate" on Iran.