"The aim is clear, and it is to impose guardianship on the state", it said, insisting authorities would "take all measures necessary.to foil attempts to affect or harm Qatar's society and economy".
Saudi Arabia's official state news agency, citing an official source, said the kingdom had made a decision to sever diplomatic and consular relations with Qatar "proceeding from the exercise of its sovereign right guaranteed by Global law and the protection of national security from the dangers of terrorism and extremism".
The Saudi-led coalition battling Iran-backed rebels in Yemen said it had expelled Qatar from the group.
"He is totally aligned with Abu Dhabi and Riyadh, who also want no compromise with either Iran or the political Islam promoted by the Muslim Brotherhood".
Qatar, however, claims that hackers took over the media outlet's website and published the comments, which it says were fake.
The Kremlin said that it hoped the matter could be solved in a peaceful manner. Al Thani reportedly hailed Iran as an "Islamic power" and criticized US President Donald Trump's policy towards Tehran.
Doha denied the comments and said it had been the victim of a "shameful cybercrime".
The crisis is the worst to hit Gulf Arab nations since the creation in 1981 of the Gulf Cooperation Council (GCC) grouping Saudi Arabia, Bahrain, the UAE, Kuwait, Oman and Qatar.