A 17-year-old girl has shocked NSW authorities by stabbing her younger sister to death.
Emergency services were called to a Boolaroo address to address a stabbing that occurred at 3:45pm on Monday.
Australian correspondent Murray Olds says police were mystified by this case - and haven't uncovered a motive.
LISTEN ABOVE

Enda Brady: UK correspondent on the additional calls for Sir Keir Starmer to resign
04:23

Paul Bloxham: HSBC Chief Economist ahead of Australia's 2026 federal budget
04:17

Jamie Mackay: The Country host on what the latest Rabobank agribusiness monthly report means for Kiwi farmers
04:46