Richter here. Dire news indeed.
We don't have a lot of connections in Kusari, certainly not the kind that would share this kind of intel, so that's the first I hear of this infiltration situation.
I suspect you're right about the timing being no coincidence, but that raises some disturbing questions. Carthage is an incredibly well fortified target, which leads me to believe the Cairo attack was planned first, and this taken as an opportunity by the alien forces for their own assault plans. That suggests that at best, the alien possesses a high level of intel, or even infiltration of the Core. At worst, it suggests active cooperation, in which a combined plan was formed in which Cairo is the main target, and the Carthage assault intended to bind forces in Mu.

In any case, I'll keep the Erdbeben in the region and ensure maximum combat readiness. Evacuating Memphis is out of the question, we are committed to our allies and have invested too much in the region.
I'll see what other forces I can divert but realistically, it's not going to be much. I'd also suggest contacting the Phoenix if you haven't already, I'm sure they'd be willing to assist.