An unknown person put postings on some climate skeptic websites that advertised an FTP file on a Russian FTP server, here is the message that was placed on the Air Vent today:

We feel that climate science is, in the current situation, too important to
be kept under wraps.

We hereby release a random selection of correspondence, code, and documents

The file was large, about 61 megabytes, containing hundreds of files.

It contained data, code, and emails from Phil Jones at CRU to and from many people.