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Rio high-rise collapse highlights World Cup, Olympic concerns

Early photos from a collapsed 18-story building in downtown Rio de Janeiro.

Rio high-rise collapse highlights World Cup, Olympic concerns

An explosion might have triggered an 18-story high-rise to collapse in downtown Rio de Janeiro, killing at least two people, Reuters reported.

"It was like an earthquake. First, some pieces of the buildings started to fall down. People started to run. And then it all fell down at once," a witness named Gilbert told Reuters.

Brazilian news agencies suggest four survivors were found, and that as many as 11 people could be inside the wreckage, Reuters said. Agence France-Presse reports said there were 11 victims in the collapse, which happened about 8:40 p.m.

AFP said 30 people were pulled from nearby buildings. A bank and restaurant are in the area, but rescuers are unsure if they were open at the time. The disaster may have been much worse considering the area is a busy daytime center, but empties out after dark.