Four children were killed and four others injured in an attack on a daycare center in Blumenau, southern Brazil, local media reported on Wednesday.

The 25-year-old attacker turned himself into the police, authorities said. 

"It is with immense sadness that I received the terrible news that the Good Shepherd preschool in Blumenau was invaded by a murderer who attacked children and employees. Unfortunately, four were killed," Santa Catarina state Governor Jorginho Mello said in a statement, declaring three days of mourning. 

(With input from AFP)