Denver Girls Isis - Three girls raging from the ages of 15 to 16 escaped their home in Denver to leave the country and join Isis in Syria.

Assad Ibrahim suspected something was wrong when he received a phone call on Friday from his daughter's school in Denver reporting that she had skipped classes. After that, Ibrahim called to her mobile and she answered. Apparently, she never told him where she was leaving, though.

Ibrahim's daughter had left with two more girls who were sisters in a plane to Frankfurt, where they were stopped. Why?

It turns out that Ibrahim called Ali Farah, the father of the two sisters and asked him if his daughter's passport was missing, because his daughter's one was. Farah checked and the girls passports were indeed not there.

Together with the passports, another thing that the girls had taken was $2,000 in cash.

The two fathers called the FBI and told them that they thought their daughters had left to Turkey, CNN noted.

The FBI took care of stopping them in Frankfurt where they found them through their passports and questioned them. Apparently, they gave no facts about where they were heading in relation to ISIS.

What was found, though, that was related to ISIS indeed was the fact that the authorities went through the girls' computers and found that they had been searching how to get to Syria and other terrorist information, it seems.

After the questioning, they were released and it hasn't been completely decided yet, but it's probable that no charges will be raised against them as they are minors and things get complicated with that in mind.

A curious and worrying detail is that these 3 girls who ran away from Denver to join ISIS are not the first ones. Several teenagers have been trying to commit the same aim.

"They're often times searching for an identity, because what the jihadis are actually pushing is a specific narrative, which is: Your people (Muslims) are being oppressed in this place called Syria; your government is doing nothing."

"We're the only ones who are actually going to help you out. Why don't you join the fight?" Aki Peritz shared on what could take these young people all over the world at the time to join ISIS, a sense of belonging is his reason.

The 3 girls from Denver who left to join ISIS are a case among many. Another well-known one at the moment is a 17 year-old Australian boy who left "fishing" and was seen in a video with ISIS.