Same local time? That's a way to say it doesn't matter that they were, what... 10,000 miles and 12 hours apart?
No... that doesn't look coordinated to me.
Have you ever used email? If so, are you familiar with the "CC:" option (courtesy copy)?
Hypothetically, picture one email being written that said:
Activated
Procede With Plan A
Strike @ 8 PM on 10.1
Picture it being cc'd to a couple of cells...perhaps in different time zones...and obviously encrypted in a painstaking procedure (hence, just one email).
...just a thought, but when do you think that they would blow up? Would you call that uncoordinated?