0 sats \ 0 replies \ @yo2xncv0 27 Oct \ on: Japanese authorities trace Monero, arrest 18 in $670K laundering case bitcoin
They are vague about the details.
Most likely got them as they left Monero (offramping onto an exchange or naively swapping in and out of transparent crypto) like all these articles claiming to have "traced" Monero.
Makes for good clickbait though