Citibank hacked?

I logged in and saw this note in my account. Anyone else can verify this? I tried searching but didn't see any public details.

Your Citi® Dividend Platinum Select® Visa® Card account ending in xxxx was illegally obtained as a result of a data compromise and is at risk for unauthorized use, you will not be responsible for any unauthorized charges!. To minimize this risk, we have issued a card(s) with a new account number ending in xxxx.