GoogleDNS down. Zone .us down

We have been watching for an hour how the zone lies .US
They write on Twitter about GoogleDNS, maybe it's related things.

There are no explanations yet.
Twitter recommends switching to OpenDNS, it works
- 208.67.222.222
- 208.67.220.220

Update: seems to have risen.
By indirect evidence, the .US zone lay somewhere from 19:10 to 20:00 UTC