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

The US-allied kingdom has also designated as terrorist the Nusra Front and the Islamic State in Iraq and the Levant, whose fighters are battling Syrian President Bashar al-Assad, the Interior Ministry said in a statement published by state media.

Yesterday’s move appeared to enforce a royal decree last month in which Riyadh, which backs some rebel groups in Syria with money and arms, said it would jail for between three and 20 years any citizen found guilty of fighting in conflicts abroad.

It underscored concern about young Saudis hardened by battle against Assad coming home to target the ruling Al Saud royal family – as has happened after the wars in Afghanistan and Iraq. 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.

Sunni doctrines challenge Saudi principle of dynastic rule

Last month’s decree said a committee would be set up to determine the groups to be outlawed. The ministry’s statement yesterday said the groups mentioned were those the committee had agreed on and that had been approved by the authorities.

Riyadh fears the Brotherhood, whose Sunni Islamist doctrines challenge the Saudi principle of dynastic rule, has tried to build support inside the kingdom since the Arab Spring revolutions.

In an unprecedented move, Saudi Arabia, the United Arab Emirates (UAE) and Bahrain recalled their ambassadors from Qatar on Wednesday, saying Doha had failed to abide by an accord not to interfere in each others’ internal affairs.

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

The Interior Ministry said yesterday the royal decree would apply to both Saudis and foreign residents who joined, endorsed or gave moral or material aid to groups it classifies as terrorist or extremist, whether inside or outside the country.

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