Saudi Arabia vowed to use "an iron fist" after 11 members of the security forces were injured by attackers during unrest in a Shiite Muslim town in the east, the official Saudi Press Agency said. The government accused an unidentified "foreign country" of seeking to undermine the stability of the kingdom as a result of the violence in Awwamiya, in which the assailants, some on motorcycles, used machine guns and Molotov cocktails, the Riyadh-based news service reported late Tuesday. A man and two women were also injured, it said.