According to an unpublished study of 259 officer-involved shootings in Chicago between 2006 and 2014, 95 percent of the victims were people of color. While less than a third of Chicago's population is black, 81 percent of victims were African Americans, according to the study by Georgia State University law professor Nirej Sekhon, based on data from the Independent Police Review Authority, which investigates police shootings. The study found that almost 90 percent of the shootings took place in census tracts where minorities outnumbered whites. Of those, 73 percent occurred in tracts where blacks made up at least 90 percent of the population. The tracts in which the shootings took place are among the poorest in the city.