A Dutch teen sent a tweet to American Airlines that was supposed to be funny, but she quickly learned that it was no laughing matter. The 14-year-old, going by "Sarah" on Twitter, wrote in a tweet to American Airlines, "hello my name's Ibrahim and I'm from Afghanistan. I'm part of al qaida and on June 1st I'm gonna do something really big bye."

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The airline responded, tweeting back that "we take these threats very seriously" and that it was forwarding her IP address and information to the FBI.

The girl then insisted it was a joke and that her friend had sent the tweet, writing, “I’m just a fangirl pls I don’t have evil thoughts and plus I’m a white girl." Despite the pleas, the teen was arrested in Rotterdam on Monday.

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Fox News legal analyst Peter Johnson Jr. discussed the case this morning on Fox and Friends, explaining that the girl's tweet has led to copycats, including another joking threat to Southwest Airlines.

Johnson agreed with Steve Doocy's call for parents to sit down with their kids and explain that what they do on social media can have serious consequences. Johnson noted that many times teens think that what they do online or on social media is anonymous, when in reality authorities can in most cases easily track people down.

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