Police have closed off streets and established an exclusion zone in Brisbane's north as they negotiate with a man in relation to a fatal stabbing.
An emergency situation at Carseldine was declared by police about 9pm on Friday with an exclusion zone put in place in Denver Street, Lucinda Street, McCallum Street and Gympie Road, Queensland Police said in a statement.
It's understood police are negotiating with Lee Matthew Hillier, 39, who they have been searching for since former soldier Nathan Frazer was fatally stabbed on a Murrumba Downs road early on Thursday.
Hillier was handed a four-and-half year jail term after he staged a siege in the Queen Street Mall five years ago.
News crews captured the dramatic siege, screening live footage of a heavily tattooed man who'd taped a semi-automatic pistol to his hand. At one point the gunman held the weapon to his throat.
The siege ended when police shot him with bean-bag bullets.
At his sentencing hearing in January the following year, Hillier told the court he never meant to hurt anyone and said he had relapsed into drug addiction after an earlier stint in prison.
Detective Inspector Damien Hansen earlier on Friday said it was possible Hillier was armed and warned people not to approach him.
Residents within the exclusion zone are asked to remain indoors and those outside the zone should avoid the area.