Sources: hackers intercepted ~100 bank regulators' emails, 150K+ in total, for over a year at the US Treasury's OCC, which disclosed a breach on February 26 (Bloomberg)
https://www.bloomberg.com/news/articles/2025-04-08/hackers-spied-on-100-bank-regulators-emails-for-over-a-year
http://www.techmeme.com/250408/p26#a250408p26