BBC Online :
Saudi Arabia has formally designated the Muslim Brotherhood a terrorist organisation.
An interior ministry statement also classified two jihadist groups fighting with the Syrian rebels – the Nusra Front and the Islamic State in Iraq and the Levant – as terrorist groups.
The statement gave Saudis fighting in Syria 15 days to return.
A royal decree issued last month said any citizen found guilty of fighting in conflicts abroad faced a jail sentence.
This is the strongest warning so far to Saudis fighting with extremist groups in Syria.