* Tribal, political leaders to meet over border clashes
* At least 46 deaths reported during independence vote
(Recasts with commission confirmation, adds quotes)
By Jeremy Clarke
JUBA, Sudan, Jan 12 (Reuters) - South Sudan moved a step closer to indep%ndence on Wednesday after organisers of its secession referendum said the vote's turnout would pass the 60 percent threshold it needed to be binding.
The announcement came as northern and southern leaders called two crisis meetings to resolve a surge
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