At least three children, a teacher and a school assistant have been killed after a teenager burst into a daycare centre and attacked the people inside with a machete.   Not long after school started on the morning of Tuesday, May 4, the suspect attacked a nursery called Creche Aquarela Berçário, where children between two and six years of age are taught.   The horror incident took place in the city of Saudades, in the West Zone of Santa Catarina, Brazil.   …