A building collapsed in central Nairobi Monday while more than 280 workers were inside, leaving at least eight people dead, witnesses and construction workers said. More than 50 seriously injured people were rushed to hospitals, medics said. Dozens of rescuers dug into the rubble with their bare hands while the injured were loaded into any available car to be taken to area hospitals. Eight dead bodies were visible at the scene. A hand could be seen waiving for help from under a concrete beam. One of the workers said that 280 men were on the site. Another of the workers, who would not give his name, said an inspector had warned last week that the structure was not safe and they were trying to stabilize the building. Hundreds of bystanders formed lines to carry away chunks of concrete and wooden scaffolding, which a front loader then pushed away from the site.