Saudi men gather around debris following a blast inside a mosque, in the mainly Shiite Saudi Gulf coastal town of Qatif, 400 kms east of Riyadh, on May 22, 2015. A suicide bomber targeted a Shiite mosque during Friday prayers in Kudeih in Shiite-majority Qatif district, the interior ministry said, with activists saying at least four worshippers were killed. AFP PHOTO / HUSSEIN RADWAN (Photo credit should read HUSSEIN RADWAN/AFP/Getty Images)
