Dubai’s Expo 2020 on Saturday offered conflicting figures for how many workers had been killed on site during construction of the massive world’s fair, first saying five and then later three.

In a later statement, Expo apologized and described the initial figure as a “mistake.” Authorities had refused for months to publicly provide any figures for construction-related casualties in the run-up to the $7 billion fair rising from the desert outside Dubai, designed the burnish the city’s reputation abroad and draw millions of visitors.