An Islamist militant suicide bomber disguised as a woman blew himself up outside a Shi'ite mosque in eastern Saudi Arabia on Friday, killing himself and three other people, the second attack of its kind in the world's top oil exporter in one week. The bombing, which was claimed by Islamic State, could further escalate sectarian strife in the kingdom, where anti-Shi'ite sentiment has been stoked by a military campaign against Iranian-allied Houthi militias in neighboring Yemen since March. The Interior Ministry said a suicide bomber disguised in women's clothes blew himself up outside the al-Anoud mosque's entrance in the city...