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.
Two powerful earthquakes struck Venezuela on Wednesday, killing at least 32 people and injuring 700 more as buildings collapsed in and around the capital Caracas, interim President Delcy Rodriguez said.
President Donald Trump's administration has asked the US Congress on Wednesday for $87.6 billion in additional funding, most of it related to the Iran war, setting the stage for another fight with lawmakers already frustrated with the conflict.
An earthquake of magnitude 6.9 has struck Japan's northeast coast on Thursday, but no tsunami warning was issued, no injuries were immediately reported and no irregularities were found at nuclear facilities, the authorities said.
US President Donald Trump has stated on Tuesday that Iran had agreed to nuclear inspections into "infinity," while Tehran said it had made no such concession in negotiations, raising questions about the viability of their fragile peace deal.
Oman has coordinated with the International Maritime Organisation (IMO) to establish a temporary maritime corridor for vessels transiting the Strait of Hormuz, according to its local news agency.