UPDATE: Citi’s website is back up and running after briefly being shut down.
Anecdotally, it appears that Citi account holders are currently being prompted to answer additional security questions when logging into their accounts.
Here’s the error message users trying to go to citibank.com were previously seeing:
And here’s the tweet earlier threatening the bank:
‘Tango Down’ is the military term used when a target has been taken down or otherwise eliminated.
This comes in the wake of continuing attacks by hackers on Brazilian banks on Thursday.
The WSJ reports that Banco do Brasil SA, Itaú Unibanco Holding SA and Banco Bradesco SA were affected. Some of the Brazilian target’s websites remain down or only partially functional.