citi.com temporarily unavailable

Citibank Online Site Outage. citi.com and citibank online are temporarily unavailable. It gives you a number to call for immediate assistance (1-800-374-9700).

It's not just me either- my friend who lives in a different state has the same issue. I think they should give a reason or an estimated time. This is very strange, especially for 1am on a Wednesday night. I'm curious as to what the problem is.