Google Drive and related apps experiencing outage for some users (update)

Google Drive and some related services are currently experiencing issues for some users, according to Google.

We’re investigating reports of an issue with Google Drive. We will provide more information shortly.
Affected users will notice 500 errors and latency.

The same service issues apply to Google Docs, Google Sheets, and Google Slides, which each have the same error message from Google. The notice was first posted at 8:20 AM PST.

Update 9:20 AM PST: We are continuing to investigate this issue. We will provide an update by 10/27/14 1:30 PM detailing when we expect to resolve the problem.

Update 11:18 AM PST: Our team is continuing to investigate this issue. We will provide an update by 10/27/14 3:30 PM with more information about this problem. Thank you for your patience.

Update: Google says the issue has been resolved and has released the following statement on the matter:

The problem with Google Drive should be resolved. We apologize for the inconvenience and thank you for your patience and continued support. Please rest assured that system reliability is a top priority at Google, and we are making continuous improvements to make our systems better.