Is it within their jurisdiction though? "National security threat targeting foreign leaders and the UN" clearly is, but just fighting scammers and fraud is local LEA or FBI job
And that's the point. No-one would have thought bad of them for following up on stuff within their bailiwick and uncovering a scam support operation. It's the old caught-the-major-bad-guy-in-a-routine-traffic-stop tale, after all.