"We have gained access to the Saudi Ministry of Foreign Affairs (MOFA) network and have full control over more than 3000 computers and servers, and thousands of users. We also have access to the emails, personal and secret information of hundreds of thousands of their staff and diplomats in different missions around the world," the Yemen Cyber Army (the hackers) said in a statement which has been published on many hacking related websites.
The group has published some of the documents online and have threatened the Saudi government that they would inflict greater damage on them by releasing more documents, archived since the 1980s.
The group has said that it will wipe the servers of the Foreign Ministry of Saudi Arabia at midnight on Wednesday.
The Yemen Cyber Army has been previously known for hacking AlHayat.com.