A deadly suicide bombing took place at Shiite mosque in eastern Saudi Arabia on Friday.
A blast ripped through a Shiite mosque in eastern Saudi Arabia on Friday, authorities said, in what an activist said was a deadly suicide bombing.
The interior ministry said a large explosion hit the mosque in Kudeih in Shiite-majority Qatif province during the main weekly prayers.
An activist said at least four worshippers were killed and others wounded, and news websites in eastern Saudi Arabia posted photographs of bodies lying in pools of blood.
Qatif hospital issued an urgent call for blood donations after the attack and called in off-duty staff to cope with the high number of casualties, the activist said.
An interior ministry spokesman said an investigation has been opened and more details of the explosion would follow.