US chipmaker Intel is investigating a security breach after earlier today 20 GB of internal documents, with some marked “confidential” or “restricted secret,” were uploaded online on file-sharing site MEGA.

The data was published by Till Kottmann, a Swiss software engineer, who said he received the files from an anonymous hacker who claimed to have breached Intel earlier this year.

Kottmann received the Intel leaks because he manages a very popular Telegram channel where he regularly publishes data that accidentally leaked online from major tech companies through misconfigured Git repositories, cloud servers, and online web portals.