getting back to the original post. Heard on the news that officials interviewed every single passenger separately. The reason behind it was completely random (i.e. the just picked it out of a hat). According to the newsies more longhaul flights will randomly be stopped and searched before departure and after arrival (seems a bit silly once it's back on the ground why not let customs do their job). Come to think about it there probably was another reason for the search and this was just an excuse.