Timing is everything. There is a time for the Mueller report to come out, and far, far many more times for it to not.
False flag very likely on thursday or friday in anticipation of this. They may go with Wednesday, but their favorite tactic is to throw local PDs off balance by running exercises nearby and then hitting a place short on officers (or officers who aren't part of 'the company' are shipped out of the department for training). Those events usually come at the end of the week, and the goal is to give everyone plenty to talk about over the weekend.