The possible coincidence to a recent event here in NYC troubles me. It could be part of a wider initiative. The Technical Assistance Response Unit is a well-trained group, with resources (training and technology) from agencies a few hours south of here by car or train. I'd be curious if this is taking place in other parts of the City.
Oh, and by the way, (to the snarky respondent of the OP), two plus two equals zero in modular arithmetic of order four. But I'll guess it's been a few years since high school math (it certainly has for me!), so I'll cut you some slack.