NEW : Expert : Maritime crossings into the United States have become a `` new frontier '' for smugglers and terrorists alike.'' As part of a scam , officials say , traffickers leave migrants adrift at sea . The statement from Mexican authorities on Monday suggests that attempted border crossings by boat are drawing increasing concern . 35 % of Mexicans in recent survey say they would move to the United States .
NEW : Expert : Maritime crossings into the United States have become a `` new frontier '' for smugglers and terrorists alike.'' As part of a scam , officials say , traffickers leave migrants adrift at sea . 35 % of Mexicans in recent survey say they would move to the United States .