Obama authorised a secret mission to free slain journalist and other Americans but they were not found, officials say.
Top US law official visits Ferguson protesters as dwindling numbers of demonstrators demand justice for teen's killing.
Police fire tear gas to break up rally by supporters of the ex-general who lost last month's presidential vote.
Prayuth Chan-ocha voted into power by army-run legislature three months after he overthrew government.
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Inside Story21 Aug 2014 06:46 GMT
The Islamic State group sends a graphic "Message to America" said to show the beheading of an American journalist.
Al Jazeera World20 Aug 2014 11:25 GMT
How Germany's failure to track down the killers of nine immigrants affected its relationship with the Turkish community.
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