[HiTech RedNeck]

The best case scenario is that they were a bunch of musicians that deliberately behaved suspiciously to frighten the passengers.

Yes, it looks like a prank. A prank which should have been viewed with the same sense of humor that jokes in airports about bombs are.

[The_Media_never_lie]

Prank or probe or whatever, this was not funny. PC must end and these people should not feel free to do such things.