The top U.S. general in South America says about 100 recruits have left his region to go fight with Islamic extremists in Syria. He says if they return to their home nations, those recruits could come up through cross-border networks into the U.S.

Gen. John Kelly is head of U.S. Southern Command. Kelly says Iran and Islamic extremist groups are doing a fair amount of recruiting in the region. He says most recruits have left from Caribbean nations to go to Syria.

Kelly says the small Caribbean nations are extremely concerned about the extremists returning home to conduct terror operations, because they don't have any real ability to deal with the problem. He says the recruits could use the drug and other criminal networks to cross into America.