The FBI believes three teenage girls from suburban Denver were headed to Syria to join Islamic State militants in Syria.
The Associated Press reports that two sisters, ages 17 and 15, and their friend, age 16, were stopped at the Frankfurt, Germany en route to Turkey and then Syria.
The sisters are of Somali descent, while their friend is of Sudanese descent.
Now the FBI is trying to determine whether any of their friends may try to join Islamic State.
The sisters were reported missing by their father after they skipped school Friday.
The families expressed shock and said they hadn’t had problems with the girls.