NEW : Also , a car bomb explosion in an eastern Baghdad commercial district killed at least one Iraqi civilian and wounded four others Wednesday , an Interior Ministry official said . Polish diplomat released from hospital , will be treated further in Samarra . Blast injures the envoy , Gen. Edward Pietrzyk , and kills Three . Car bombs in Baghdad neighborhood strike American convoy . New Joint Chiefs chairman begins weeklong visit to Afghanistan , Baghdad .
NEW : Polish diplomat released from hospital , will be treated further in Samarra . Blast injures the envoy , Gen. Edward Pietrzyk , and kills Three . Car bombs in Baghdad neighborhood strike American convoy . New Joint Chiefs chairman begins weeklong visit to Afghanistan , Baghdad .