Doonside school stabbing: Shock update in fatal school attack that left one teen dead and another seriously injured

A boy has been charged with murder following the fatal stabbing of another boy at a western Sydney school.

Emergency services were called to the scene outside Crawford Public School on Power St at Doonside about 3.40pm on Friday, following reports two teenagers had been stabbed.

Before police could attend, two teens aged 18 and 19 presented to Blacktown Police Station with stab wounds.

The 18-year-old died at the scene, NSW Police said in a statement.

The other teen was taken to Westmead Hospital in a serious but stable condition.

A 16-year-old boy was arrested nearby and taken to Mount Druitt Police Station.

A NSW Police spokesman said the boy had been charged with murder and refused bail to appear at a children's court on Saturday.

Officers from Blacktown PAC with assistance from State Crime Command's Homicide Squad has commenced an investigation into the incident under Strike Force Cooey.

A school bus with its hazard lights flashing was seen locked down at a bus stop in an area sealed off by police as the investigation continues. Witnesses reported seeing teenagers fighting on the bus in the moments before the stabbing.

It's believed children as young as five witnessed the incident, with the 18-year-old in the company of family and friends when the attack occurred.

'His last words were ‘help mum I can’t breathe',' a relative of the young man who died told the Saturday Telegraph.

'He was such a beautiful boy. They were just on their way to go to McDonalds.'

A resident who lives in the area said they 'saw a youth jumping her fence and several others running through neighbouring back yards'.

The altercation is believed to have been a result of tensions between rival postcodes involving the RFA (Ready For Anything) and 67 gangs.

Teens were seen running from the scene while throwing up gang signs, The Daily Telegraph reported.

The RFA gang is from Mount Druitt while the 67 group, which stands for postcode 2767, is from Doonside.

The stabbing victims are not believed to have been students at Crawford Public School.

A NSW Police spokesman said: 'About 3.40pm, emergency services responded to the stabbings near a school on Power Street, Doonside.'

'Before officers attached to Blacktown Police Area Command could arrive on scene, two teenage boys presented to Blacktown Police Station with stab wounds.

'They were treated at the scene for serious stab injuries. A boy in his teens died at the scene and the other teenage boy was taken to hospital in a serious condition.

'Police have established crime scenes at both locations and are investigating the incident.

'Following inquiries police have arrested one person nearby.'