At least three are dead, and seven wounded, at a Shia mosque in east Saudi Arabia following a gun attack during Friday prayers br Saudi Arabia: Three dead following gun attack and explosion at Shia Mosque in al-Ahsa br The timing of the assault appears to have been planned to cause maximum casualties, occurring when the Imam Rida Mosque in Mahasen, al-Ahsa, would have been packed with worshippers br Mohammed al-Nimr, the brother of recently executed Shia cleric Sheikh Nimr al-Nimr, told Associated Press that a number of wounded had been confirmed and ambulances and security forces had quickly rushed to the scene.