Project volunteers sample news stories to extract minimum and maximum numbers of civilian casualties. Each incident reported at least by two independent news sources is included in the Iraq Body Count database. In December 2007, IBC announced that they would begin to include deaths reported by one source, and that the number of deaths provided by such reports would be openly tracked on its database page.[7] Between 3.3 and 3.5 percent of deaths recorded by IBC are currently[when?] listed on the database page as derived from a single source.