According to AFP:
Three Gulf monarchies recalled their ambassadors from Doha Wednesday in an unprecedented escalation in tension with fellow Gulf Cooperation Council member Qatar, accused of backing the widely banned Muslim Brotherhood.
…Saudi Arabia, the United Arab Emirates and Bahrain said the decision was made in protest against Qatar’s alleged interference in their internal affairs.
…the ambassadors’ recall followed what newspapers described as a “stormy” late Tuesday meeting of foreign ministers from the six-nation Gulf Cooperation Council (GCC) in Riyadh.
The pan-Arab Al-Hayat daily reported that the “marathon” talks lasted nine hours because of “differences on several issues, among them inter-Gulf relations”.