A multistory building collapsed in Rio's center Wednesday evening, leaving rubble strewn over a wide area but confusion about the number of possible victims and the cause. Thick layers of debris covered cars and motorcycles. A neighboring building sustained serious damage, and television showed at least two people on its roof apparently awaiting help from firefighters, AP reported. There were differing reports about possible deaths. A spokeswoman from the city's Civil Defense department said two people were confirmed dead, but officials from City Hall and the municipal health department later disputed that, saying no deaths had been confirmed by early Thursday. It was not clear how many people were injured. Searchers were still picking through the rubble hours after the collapse. There was a strong smell of natural gas in the area, but Rio's mayor said there were doubts that a gas leak caused the accident. It was not immediately clear how big the damaged buildings were. The one nearly destroyed was at least five stories high. It sat near Rio's historic Teatro Municipal and the Fine Arts Museum, both of which appeared undamaged, AP reported. Police cordoned off the area and electricity to the street was cut off for safety reasons.