[JURIST] The Pew Hispanic Center [official site], a private research group, released a report [text] Monday documenting recent massive growth of the illegal immigrant population in the United States. A 23 percent increase was reported in the population of undocumented residents over the past four years, from 8.4 to 10.3 million people. The report largely attributes the increase to the rising numbers of unauthorized Mexicans entering the US. AP has more.