Several people were killed and injured in a suicide attack in Riyadh on Friday, media reports.
According to one witness , a huge explosion at the Imam Ali mosque in a village in the province of Qatif, where more than 150 people were attending the prayer.
The Saudi state news agency confirmed the attack occurred at a mosque in eastern Saudia Arabia and said more details would be provided later.
Source told the Reuters news agency that there were at least 30 deaths estimated in the explosion, while an activist told the AFP news agency that at least four worshippers were killed.
Shia population in Saudi Arbia mostly lives in two districts of the Eastern province – Qatif on the Gulf coast, and al-Ahsa, southwest of the provincial capital al-Khobar, Aljazeera said.
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