"I wish all those wounded a quick and safe recovery, and I thank the emergency medical services for their swift and organised response in rescuing those injured," the president said, per a statement from his office.

Milanovic said he expected a prompt and thorough investigation by the police and the state attorney's office so all the circumstances of the crime could be determined and those responsible punished.

He expressed his shock at the brutal and unprecedented crime in Daruvar. "This is a terrifying warning and a final call to all relevant institutions to do more to prevent violence in society, including even stricter control of firearm possession."