article_snippet: The number of foreign fighters traveling to join ISIS's ranks is increasing at an alarming rate, Rasmussen said last month.
article_snippet: More than 20,000 fighters, from more than 90 countries, have traveled to the ISIS battlefield, according to the testimony of  Nicholas Rasmussen, director of the National Counterterrorism Center, before the House Homeland Security Committee.
article_snippet: The rate of foreign fighters traveling to Syria "exceeds the rate of travelers who went to Afghanistan and Pakistan, Iraq, Yemen or Somalia at any point in the last 20 years," Rasmussen said.
article_snippet: Of More than 20,000 fighters, from more than 90 countries, an estimated 3,400 are believed to have come from Western countries, including more than 150 from the United States, officials said.