A 15-year-old boy has been charged with murder after a teenager was allegedly stabbed to death near a Sydney high school.
Police believe a 17-year-old boy died from stab wounds to his thigh following a confrontation at a park in Sydney's north-west about 4.20pm on Monday.
The alleged stabbing occurred in a reserve area, close to several high schools and within sight of multiple people who were walking nearby.
Police said those involved were not from the nearby school and officers allege it was not a random attack.
A number of female witnesses who were in the park at the time rushed over to give aid to the victim.
Paramedics were called to the scene, but the 17-year-old died soon after.
"It would have been a horrifically confronting situation for those people and I can only praise them for their efforts," detective superintendent Naomi Moore told reporters.
"It was a potentially dangerous situation they were walking into, but they thought nothing of themselves to go in and render aid."

Police remained at the crime scene in Sydney's northwest on Tuesday. Source: AAP / Dan Himbrechts
'Unimaginable loss'
NSW Premier Chris Minns sent his condolences to the teenage boy's family and friends.
"I am deeply saddened by the death of a teenage boy at Rouse Hill and extend my sincere condolences to his family and friends," he said in a statement.
"It is an unimaginable loss, and the whole community will feel the impact."
Local federal MP Michelle Rowland said she was deeply saddened by the incident.
"There is no place in our community for these acts of senseless violence, and I know this news will be particularly distressing for local families," she said.
The 15-year-old boy has been refused bail and will appear in a children's court on Tuesday.
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