From the BBC, "Part of a building nearly 20 storeys high has collapsed in the centre of Rio de Janeiro, Brazil, leaving rubble strewn across a wide area."
"Officials believe unauthorized construction work inside a 20-story, 72-year-old building damaged its structure and caused it to crumble, wrenching down two neighboring office buildings of approximately the same age...Fonseca told news media gathered at the site that workers had removed several walls on the ninth floor, but said that didn’t affect the building’s infrastructure. He didn’t know if there was an engineer in charge of the project..." (Fonseca was a worker that survived)