The confidential emails of Facebook executives leaked online, The Guardian reported.

According to the source, nearly 60 pages of exhibits from a lawsuit between Facebook and Six4Three, were posted anonymously on GitHub on Friday. They include emails between various Facebook executives, including CEO Mark Zuckerberg, and a “highly confidential” 2012 memo detailing various policy matters.

The Guardian has not been able to independently confirm the authenticity of the documents, the source noted.