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.
US President Donald Trump said on Saturday he had been told about the concept of a deal with Iran, but was waiting for the exact wording, while warning there was still the possibility of restarting strikes on the country if Tehran misbehaves.
The Israeli military issued an urgent warning on Sunday to residents of 11 towns and villages in southern Lebanon, urging them to evacuate their homes and move at least 1,000 metres (3,300 feet) away to open areas.
Ukrainian drones attacked Russia's Baltic Sea port of Primorsk on Sunday, temporarily setting it on fire, local governor Alexander Drozdenko said on the Telegram messaging app, as Kyiv launched a wave of strikes on targets across the country.
Heavy rains that hit northeastern Brazil over the last 48 hours have killed at least six people and displaced thousands in the states of Pernambuco and Paraiba, the federal government said in a statement on Saturday.
His Highness Sheikh Mohammed bin Rashid Al Maktoum, Vice President and Prime Minister of the UAE and Ruler of Dubai, has visited the site of the tunneling works now officially underway for the Dubai Metro Blue Line, with a completion date set for 2029.
The General Civil Aviation Authority (GCAA) has announced the full resumption of normal air navigation operations within UAE airspace and the lifting of temporary precautionary measures.