A Miami State High School student has been stabbed in an incident believed to involve an ex-student. This after a 13-year-old boy was held by police after a shooting threat there in January.

The Courier Mail reported that the 15-year-old victim was in a serious but stable condition after being stabbed in the stomach at the school on Tuesday.

Police rushed to the scene when the alarm had been raised. The offender is believed to be still on the run.

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Police cordoned off Miami State High School after a 15-year-old was stabbed there on Tuesday

A woman is seen here comforting a teenager - presumably her daughter - after the attack

The ABC reported that businessman Mark Storay said he was near the school talking to a friend when the teenage stabbing victim ran over to him.

'There was blood profusely pouring out of his stomach - we laid him down here on the grass and raced in and got a swab,' he said.

'In the meantime my friend rang the ambulance and police - there's a medical centre across the road - and we went in there and called out "emergency there's a young guy stabbed".'

'There was blood profusely pouring out of his stomach', a witness said of the victim

Officers and police dogs searched the surrounding areas following the attack

In January the police surrounded Miami High, off the Gold Coast Highway after a shooting threat

The teen was stabbed around 12.45pm on Tuesday on Hillcrest Avenue in Miami. He was taken by ambulance to the Gold Coast University Hospital. Police have no motive for the attack as yet.

Miami High was also the subject of a lockdown in January when a 13-year-old boy was held by police after making a shooting threat at the Gold Coast school.

At that time the Miami High School went into lockdown after several students received threatening text messages. Police wearing bullet proof vests swarmed the school before calm was restored.