The Greater Binghamton Sports Complex collapsed Sunday. Officials say no one was inside when it happened and there are no injuries. But this is not the first time the facility has had structural issues. The roof fell through last December after the city saw heavy snow. The owners of the complex were in the process of rebuilding it after that incident. The project began in January. The Choconut Center Volunteer Fire Department led the response Sunday. Right now, they say they're not sure what caused this second collapse. The complex was at one time one of the largest free-standing domes in the country.