U.S. authorities believe three American teenage girls from suburban Denver may have been trying to join Islamic State (ISIS) militants in Syria. AP cited a U.S. official as saying that it's clear that the girls, 17- and 15-year-old sisters of Somali descent and their 16-year-old friend of Sudanese descent, were heading for Syria, but they are still trying to find out what kind of contacts they had there.

The teens were stopped by FBI agents at the airport in Frankfurt, Germany, over the weekend and sent back to Colorado, where they were reunited with their families. Their fathers' had reported them missing after they took their passports and $2,000 in cash and skipped school Friday, but didn't know where they might have gone. It's unclear whether the girls will face charges.

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