Guard stabbed at Brisbane private school

A burglar who stabbed a security guard five times at an elite Brisbane girls' school allegedly borrowed a woman's phone to call a taxi as he fled the scene on Wednesday morning.

Already wanted by police before the stabbing, Khia Gribben fled Somerville House in South Brisbane soon after he stabbed the 51-year-old security guard just before 5.30am, Detective Inspector Tony Geary said.

Gribben, 25, borrowed the woman's phone at South Bank station and used it to arrange a taxi to meet him at Albion train station, in the city's inner north.

He was spotted on CCTV on both platforms, carrying a backpack and a green plastic rubbish bin.

Gribben was last seen getting out of the taxi at nearby Lutwyche City shopping centre about 40 minutes after the attack.

Police released a photo and CCTV of him on Wednesday afternoon as they continued their search.

Insp Geary said the man, who is known to police, had no links to the school and was on the exclusive school's property for the sole purpose of committing "a burglary offence".

The security guard initially thought Gribben was a cleaner before he came at him with a knife and stabbed him five times in the torso and arms.

The guard was not carrying any weapons.

He was taken to Princess Alexandra Hospital where he underwent surgery and remains in a stable condition.

It is understood Gribben stole items from the security guard and school, but police would not confirm what they were.

Insp Geary said several witnesses had come forward throughout the day, including the woman who lent Gribben her phone.

"We're very confident we will have him in custody in the very near future," he told reporters.

Insp Geary urged anyone else with information to come forward or for Gribben's friends to encourage him to hand himself in.

Members of the public are warned not to approach him, as he could still be armed with the knife.

Two warrants were issued for his arrest after he failed to appear at Caloundra Magistrates Court on August 16.

Somerville House remained open on Wednesday on the advice of police, who set up two crime scenes on site and another at South Bank train station.

School communications director Sarah Dreaver said parents had received regular updates about the attack since 7am and students were being offered support.

"We consider it to be a really unfortunate, random incident," she told AAP.

She said the injured guard was much-loved by the school community .

"The school's rallying behind him and his family as we do in the Somerville way," she said.

Somerville House was established in 1899 and is a day and boarding school for girls from prep to year 12.

© AAP 2017

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