This image taken from a militant website associated with Islamic State extremists, posted Saturday, May 23, 2015, purports to show a suicide bomber identified as a Saudi citizen with the nom de guerre Abu Amer al-Najdi who carried out an attack on a Shiite mosque. The Islamic State group’s radio station has claimed responsibility for that suicide bombing Friday, warning that more “black days” loom ahead for Shiites. The attack killed at least 21 people and wounded dozens in the village of al-Qudeeh in the eastern Qatif region as worshippers commemorated the birth of a revered saint. The Arabic bar below reads: “Urgent: The heroic martyr Abu Amer al-Najdi, the attacker of the (Shiite) temple in Qatif.” (Militant photo via AP)