Saudi Arabian security officials moved aggressively on Tuesday to crush an outbreak of anti-Shiite violence, arresting 15 people in six cities and killing two others in connection with what the Interior Ministry called a terrorist ambush on mosque worshipers in a minority Shiite community. At least two security officers were killed and two wounded in the crackdown on the suspected mosque assailants, who were armed with pistols and machine guns, the Interior Ministry and government-run Saudi news media reported. The mosque ambush, which occurred Monday night and left at least five people dead, came as Shiites, who are a small minority in heavily Sunni Saudi Arabia , were celebrating the eve of Ashura, one of the most sacred holidays in the Shiite branch of Islam. The identities of the assailants and their affiliations were not disclosed. But the ambush raised speculation that Saudi-born Sunni jihadists who had joined Islamic […]