Saudi Arabia has formally designated the Muslim Brotherhood as a terrorist organization, in a move that could increase pressure on Qatar whose backing for the group has sparked a row with fellow Gulf monarchies.

Saudi Arabia's Islamic religious authorities have spoken out against Saudi fighters going to Syria, but the Interior Ministry estimates that around 1,200 Saudis have gone nonetheless.

Saudi Arabia and the UAE are fuming over Qatar's support for the Muslim Brotherhood, and resent the way Doha has sheltered influential preacher Yusuf Qaradawi, a critic of the Saudi authorities, and given him regular airtime on its pan-Arab satellite channel Al-Jazeera.

The Interior Ministry also listed as terrorist Yemen's Shiite Houthi movement and Hezbollah, a radical Shiite group in Saudi Arabia which authorities say is linked to Iran and Lebanon's Hezbollah.

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