SCOTT SIMON, HOST:
This is WEEKEND EDITION from NPR News. I'm Scott Simon. This week a young man in Texas became the first American to plead guilty to terrorism charges related to the fighting in Iraq. Twenty-three-year-old Michael Wolf was arrested just before he boarded an airplane. He was on his way to join ISIS, the Islamic State of Iraq and Syria, the group that has been storming across Iraq for the past few weeks.
ISIS and hundreds of other rebel groups in Syria have inspired thousands of young men from around the world to leave their homes and join the fight. NPR's Dina Temple-Raston looks at how Westerners are getting to the battlefield and why officials are worried.
DINA TEMPLE-RASTON, BYLINE: The road to violent jihad has never been so smooth. All aspiring fighters have to do is get to Turkey.
BRUCE HOFFMAN: It's easy to hop on a commercial flight or even drive from anywhere in Europe.
TEMPLE-RASTON: That's Bruce Hoffman who heads the security studies program at Georgetown University. He says that once young men arrive in Turkey, literally hundreds of rebel groups are there to greet them. There are recruitment centers all along the border with Syria and various groups process the young men and send them on down the line. Hoffman says ISIS, the Sunni extremist group that now controls about a third of Iraq, has a sophisticated program in northern Syria.
HOFFMAN: Around Ragga and elsewhere, they've established very large training camps that are capable of absorbing these foreign fighters and putting a gun in their hand and giving them the kind of training and experience and confidence that puts them into battle very quickly.
TEMPLE-RASTON: The last great call to arm for Muslim fighters was in the 1980s after the Soviets invaded Afghanistan. About 20,000 foreign fighters traveled there and most of them were from the Gulf states. This time, while many of the volunteers are coming in from the Middle East, thousands of Westerners are showing up, too.
The largest portion of them are coming from Britain, U.S. officials say. The French government puts the French total at 700 to 800. The latest tally of Americans - about 100. And the momentum grows as ISIS gains territory. Again, Georgetown's Bruce Hoffman...
HOFFMAN: And of course, you know, no one joins a failing or a fading prospect. So the victory of ISIS or the success that they've experienced in the past few days acts as almost an amplifier - is a clarion call to those who want to be part of the struggle.
TEMPLE-RASTON: So far, little has been done to try to stem the flow of volunteers to ISIS and other groups. Steven Cook is a scholar at the Council on Foreign Relations. And he visited the region last week and stopped in Turkey, which has been a key transit point for the volunteers. Now the Turkish government is trying to figure out what to do about that.
STEVEN COOK: And there's been a significant amount of discussion recently in Turkey about trying to stem the flow of foreign fighters using Istanbul and other parts of Turkey to transit into Syria.
TEMPLE-RASTON: He says Turkey had hoped that the foreign fighters would help topple the regime in Syria so the government let the travelers pass through. Cook says the Turks are rethinking that strategy.
COOK: The Turks weren't thinking very strategically about this issue and now they have a much larger threat on their hands.
TEMPLE-RASTON: That larger threat is the real possibility that battle-hardened fighters will eventually set their sights on targets at home in Europe or the U.S. Last month, a Frenchman, who had been fighting with the ISIS in Syria, returned to France and just weeks later went to Brussels to launch an attack. He opened fire on a Jewish museum there and killed three people. Officials worry about more returnees doing the same. Dina Temple-Raston, NPR News.