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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Around 760 out of the 4,200 foreign offenders living freely in the UK have disappeared from sight, according to a leading watchdog.
Schools and nurseries are being called on to help check children have brushed their teeth.