If there's one thing you don't joke about with airlines, it's terrorism.

A Twitter user identifying herself as 14-year-old Sarah found that out the hard way after tweeting the following to American Airlines on Sunday:

"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"

It didn't take long for American Airlines to reply, telling @queendemetriax_ they "take threats like this very seriously."

The airline said it planned to forward her IP address and "details" to security and the FBI.

After an initial panic -- and denying she was a terrorist -- Sarah almost seemed to enjoy the attention: "I feel famous omg," she wrote in one tweet.

She was arrested late Monday morning, but not at the request of the FBI or the airlines, a Dutch police spokesperson told Business Insider and BNO News.

"We’re not in a state that we can communicate any state of charges at this point, we just thought it was necessary to bring this out mostly because of the fact that it caused a great deal of interest on the Internet," spokesperson Wessel Stole said.

The girl's Twitter account was no longer active as of Monday.