A man killed several people, including his mother, in a retirement home in north-eastern Croatia, media outlets reported on Monday.
Croatian news website index.hr said police confirmed the incident in the small town of Daruvar, without offering details on the number of victims.
Media reported that at least five people were killed, including one care worker.
The man is said to have broken into the care home with a weapon and fired it several times.
Index.hr said five people were killed instantly, while several others were injured.
The man was reportedly detained soon after in a café.
News website mojportal.hr said the man was born in 1973 and was a retired military policeman.
Croatian Prime Minister Andrej Plenković was due to address the incident later on Monday.
Interior Minister Davor Božinović, Health Minister Vili Beroš and Labour Minister Marin Piletić are all expected to visit the scene.