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Prescription drugs were found in the system of a 9-year-old boy who died at his home in Raetihi, police say.
Antony Christensen was discovered dead in his bed on December 7.
"Preliminary results from testing showed prescription medicine in his system," Detective Senior Sergeant Keith Borrell said today.
"These are only initial findings and we are not in a position at this stage to say what caused the death of Antony as we are waiting on final test results."
The investigation was continuing. Police were working to establish the circumstances leading up to the boy's death and his family was being interviewed.
Antony's grand-uncle Garth Hiroti said earlier this month that Antony had complained of a sore stomach before he went to bed on December 6.