Leader of tribe that includes Mohammed Khalil Hamash family dies in blast . Gunmen kill three other tribal heads who advocated national reconciliation . U.S.-led coalition troops kill two suspected militants in northern Iraq . Iraq diplomat : Meanwhile , a top American diplomat , explaining talks with Iraq on a bilateral relationship , said Tuesday the United States believes Iraq should not be used as a `` platform '' for strikes on other states . U.S. should n't be base for attacks on other states .
Leader of tribe that includes Mohammed Khalil Hamash family dies in blast . Gunmen kill three other tribal heads who advocated national reconciliation . U.S.-led coalition troops kill two suspected militants in northern Iraq . Iraq diplomat : U.S. should n't be base for attacks on other states .