An unknown militant assassinated Deputy Chairman of the Arab-Kurd Friendship Society in Diyali Shawakt Bader Thursday evening in the city of Baqouba, northeast Baghdad. Police sources said the militants fired four shots at the official while on his way home, killing him instantly.A booby-trapped car explosion earlier in the evening had claimed the lives of four Iraqis and wounded a number of others in Diyali. Meanwhile, a multi-national forces statement said a US marine had been killed by friendly fire on Wednesday in a base near Mosul. The statement did not disclose further information but said the incident was under investigation.