Four children were killed and four other injured in an attack on a pre-school in the southern Brazilian state of Santa Catarina on Wednesday, local police and a hospital said.
Police said a 25-year-old man responsible for the attack had been arrested, without providing further details.
Hospital Santo Antonio in the city of Blumenau said four kids aged zero to two were under medical care there after the attack.
President Luiz Inacio Lula da Silva called the attack a "monstrosity", dubbing it an "unacceptable, absurd act of hate and cowardice" against "innocent, defenseless children," in a Twitter post.