R01.ru down

Sites hosted on R01.ru are not available. Frightening that is unavailable and the site itself R01.ru
This I have never seen.
Does anyone have information about what happened?

UP. the site R01.ru has risen
It contains the following information:
Attention! For technical reasons, there are interruptions in the work of part of customer resources. The staff of our company is doing everything possible to restore the correct operation of sites.
Also, phones are not available to communicate with specialists of the company. Please email your questions to the appropriate services.
Sorry for inconvenience.
Not too encouraging.

UP2.
R01 in the comments writes:
Within an hour we plan to raise everyone - many have already risen.
Within a few minutes, the domain registration system will work.
')
UP3.
All servers are back in service. The incident has been exhausted.