Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. January 26, 2012 Fatalities in Brazilian High Rise Collapse VOA News Rescue workers carry the body of a victim after a building collapsed in Rio de Janeiro, Brazil, Jan. 26, 2012. Photo: AP Rescue workers carry the body of a victim after a building collapsed in Rio de Janeiro, Brazil, Jan. 26, 2012. Rescue workers in Brazil have recovered at least three bodies from the rubble of three collapsed buildings in downtown Rio de Janeiro. Brazilian media say emergency crews found the bodies Thursday as workers used dogs and heavy machinery to search through the wreckage of the buildings that collapsed late Wednesday. Mayor Eduardo Paes told reporters at least 21 people are still missing, and that at least six others were injured. Paes said the collapse of the buildings, said to be 20, 10 and four stories high, appeared to be from structural problems. Authorities also confirmed construction was being carried out on one of the buildings and could have contributed to the collapse. Witnesses said they heard what sounded like an explosion Wednesday evening, and then with a rumble, the top floors of the buildings began collapsing, covering vehicles with thick dust. One unidentified witness likened the scene to that of the September 11, 2001 terrorist attacks in the United States. "At first I thought someone was throwing rubble, that it was nothing serious," said one unidentified collapse witness. "Then I started to take some steps back and all of a sudden the building collapsed. It came down completely." Officials say the buildings were for commercial use, not residential. Television reports say police have cordoned off the area around the destroyed buildings, and that electricity has been cut off to the area over concerns of a possible gas leak. The infrastructure problems come as Brazil is making improvements before hosting the 2014 World Cup and the Summer Olympics two years later. Some information for this report was provided by AP, AFP and Reuters. .