LONDON (Thomson Reuters Foundation) - Washington should call for a United Nations arms embargo on South Sudan's warring parties, rights groups said in a letter published on Thursday, as analysts warned that fighting would flare up in the approaching dry season.<img width='1' height='1' src='http://reuters.us.feedsportal.com/c/35217/f/654198/s/421f91a2/sc/1/mf.gif' border='0'/><br clear='all'/><div class="feedflare">
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