AP, or loving the use of 'Shiites & Sunnis' ...

"...The explosion in a residential quarter south of the capital did not cause any casualties, but it marked an escalation in a long-running showdown that entered a new phase with a roundup of Shiite activists that began on Aug. 13. ... The blast struck four vehicles parked at a home belonging to security personnel working for the Interior Ministry in a mixed Sunni-Shiite area... Arab nations around the Gulf harbor suspicions about Iran's effort to expand its regional clout. Yet only Bahrain has a Shiite majority — nearly 70 percent — that is seen as a possible beachhead for Iran on the Arab side of the Gulf.... "