Despite UN sanctions, however, the illicit diamond trade still exists in Côte d'Ivoire. Rough diamonds are exported out of the country to neighboring states and international trading centers through the northern, Forces Nouvelles controlled section of the country, a group which is reported to be using these funds to re-arm. The first human presence in Côte d'Ivoire has been hard to determine because human remains have not been well-preserved in the country's humid climate. Rough diamonds are exported out of the country to neighboring states and international trading centers through the northern, Forces Nouvelles controlled section of the country, a group which is reported to be using these funds to re-arm. However, the presence of recently found weapon and tool fragments (specifically, polished axes cut through shale and remnants of cooking and fishing) has been interpreted as a possible indication of a huge human presence during the Upper Paleolithic period (15,000 to 10,000 BC), or at the minimum, the Neolithic period.