BAGHDAD (Reuters) - U.S. Senate Intelligence Committee chairman Pat Roberts said there was some concern Iraqi weapons of mass destruction had gone to Syria, and Washington vowed to carry on searching for such arms in Iraq (news - web sites). Roberts, a leading member of President Bush (news - web sites)'s Republican Party, said on Wednesday: "I think that there is some concern that shipments of WMD (weapons of mass destruction) went to Syria." He did not elaborate. Syria, which borders Iraq, has in the past denied U.S. charges it has weapons of mass destruction programs and supports "terrorist activity."...