The investigating officer believes Oscar Pistorius may be a flight risk.
"We don't want another Dewani," the officer says, referring to Shrien Dewani - the British man accused by a South African court of arranging the murder of his wife on their honeymoon there.
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David Cameron faces a revolt over the EU referendum, as he is accused of "disrespect" for dismissing local party activists' views on Europe.
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The Duchess will carry out her first engagement as Honorary Air Commandant of the Air Cadets after assuming the role in December.