Idle speculation may in the end turn out to be right, but it does us no good.
I've seen several planes from the same airport get into simultaneous trouble simply because they were filled up with bad gas, for instance. The planes who were just "topped off" flew further than the ones that were completely filled up, but a whole bunch of planes were declaring emercencies all at once.
In this day and age, it's pretty normal to *guess* that these sorts of things are terrorist related; and that may turn out to be right...but don't go confusing such a *guess* with what "must" be the explanation.
In short, wait for more facts.
5 Legislative Days Left Until The AWB Expires
I was thinking bad gas too,however the planes would be sputtering and the pilots would notify the tower of these problems. No indication of that yet,but it is early.