Atlanta's top officials holed up in their offices on Saturday as they worked to restore critical systems knocked out by a nine-day cyberattack that plunged the metropolis into technological chaos and forced some city workers to revert to paper.

On an Easter and Passover holiday weekend, city officials labored in preparation for the workweek to come.

Police and other public servants have spent the past week trying to piece together their digital work lives, re-creating audit spreadsheets and conducting business on mobile phones in response to one of the most devastating "ransomware" virus attacks to hit an American city.