(How did I miss this thread?)

At first (looking over D3Vs' timeline), I tried to find a pattern (other than knives). It looked like it was always at a school of some sort, until the super market one. I highly doubt a cult is behind this, otherwise they'd have ALL commited suicide...
The ages look like they range from kids to college students, but definately all kids. Also, before the recent one, it seemed like only one person at a time was attacking, right?
It's definately possible that a person was in charge of all of these, as only a little longer than a month after the first attack, three of them happened, one after the other, day after day, the next month.
The next attacks all happened in May, the 12th, 16th, and 18th. That's three more attacks in a row, just more spaced out as before.
At first, I though a pattern in the dates was that they would all happen after the 20th/towards the end of the month, as they did in the first four attacks, but then it quickly changed from the early middle to the later middle of the month...

That causes a few problems. Now, we could just assume that the first attack was sort of a, uh, prototype attack - something to see if they could do it successfully, without the true head of the attack getting caught. Then the actually things happened.

Let me take a guess - and if I'm wrong, let me die of shame - that the next attacks will happen either late this month, or early next month (between the 29th of this and the 10th of next), and will be about three to five day paced away from each other.