fa2fi
Thanks for your post, and of course the information you divulge does paint a totally different picture, and one that any and every airline would take immediate and drastic action on.
This was a deliberate premeditated act designed to cause panic, it was plainly not a silly prank and, as MerchantVenturer states, those responsible deserve a severe custodial sentence.
Let us hope that with forensics now available a collar or collars will be felt by the police before too long.