A 25-year-old man armed with a small axe killed four children between the ages of five and seven when he attacked a nursery in Brazil. President of Brazil, Luiz Inacio Lula da Silva, called the attack a "monstrosity", dubbing it an "unacceptable, absurd act of hate and cowardice" against "innocent, defenceless children" in a Twitter post. Last week, a 13-year-old student in Sao Paulo stabbed a teacher, killing her, and also wounded several others