This Wednesday, Oct. 22, 2014, photo shows the apartment building in Aurora, Colo., which police say is the home of two of the three teenage girls who, according to U.S. authorities, were en route to join the Islamic State group in Syria when they were stopped at an airport in Germany. The two sisters, ages 17 and 15, and their 16-year-old friend were stopped at the airport in Frankfurt, Germany.

Colorado teens' travel renews concerns about terror appeal

The episode posed vexing questions for U.S. officials, including about the use of social media by terror groups to recruit people inside the United States and what can be done about it.

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(AP Photo/Brennan Linsley)

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