Rescuers have recovered four bodies from the rubble of three buildings that collapsed in downtown Rio De Janeiro, and structural issues are one of the possibilities that officials are looking into as an explanation.
A 20-story building and adjacent 10-story and four-story ones came down Wednesday night in a cloud of dust and smoke. The site is a block from the city's historic Municipal Theater, where U.S. President Barack Obama spoke during a visit last year.
"Officials said they were investigating both the possibility of a gas leak and a structural failure," CNN reported Friday.
