Kotaku has heard that users in multiple regions can't login into the Microsoft game console's online service. Attempts to get onto Xbox Live at Kotaku's NYC headquarters haven't been successful.

Microsoft has said the following via Twitter:

We are aware of the issues some users are having with Xbox LIVE and are actively investigating. Thanks for your patience.

We'll update more on this outage as news becomes available.

Update:
As of this post's initial writing, it was Xbox Live sign-in that wasn't working. Now, at 12:50 ET, signing and accessing Zune services and video is down as well.

Update 2:
Here's Microsoft's statement on today's continuing Xbox Live problems:

"Xbox LIVE is experiencing temporary service issues with signing onto Xbox LIVE from the Xbox 360 console and from Xbox.com. Our engineering teams are working quickly to fix the problem and we expect service to be back to full performance as soon as possible. Please visit xbox.com for continued updates. In the meantime, our apologies for the interruption."

Update 3:
It's back!

Via Twitter