A recent study says illegal loggers have destroyed about 18,500 square kilometers of public forests over the past six years in the Brazilian Amazon rainforest.But, the study says, the nation's Federal Police do not investigate the loss enough.The wood cutting took place in state and federal forests that are “unallocated.”That means they are neither part of a national park nor are they considered native territories.Official data says the Brazilian Amazon has about 580,000 square kilometers of unallocated forest.That is an area almost the size of Ukraine.The public forests have become a target for criminals who illegally seize land.Igarapé Institute, a Brazilian policy research group, released the study.The group researched 369 environmental crime operations carried out by the Federal Police in the Amazon between 2016 and 2021.Only two percent targeted people illegally seizing unallocated public lands.It also found that the Federal Police created only seven operations to investigate this large loss.