A man armed with a samurai sword has been shot dead after a "siege incident" at a property at Doolandella in Brisbane's south-west this morning.

Key points: Police said the officer "didn't have any other option" after the man confronted him

Police said the officer "didn't have any other option" after the man confronted him Paramedics couldn't revive the man, who died at the scene

Paramedics couldn't revive the man, who died at the scene Four young children were in the home while the man was armed with the sword

Police said the armed man was in the Cassowary Street house with two women and four young children when they were called around 5:30am to reports of a disturbance.

After negotiations the women and children were able to leave the home.

But police said around 7:45am the man confronted officers with the sword outside the house and was shot.

Paramedics couldn't revive the man, who was declared deceased at 8:15am.

Inspector Tim Partridge said it was traumatic for everybody involved.

"It's never the intention of police to resolve a situation in this manner but unfortunately circumstances sometimes dictate that you have no other option but to take the steps that were taken today."

He said the officer who fired his weapon was "understandably stressed".

"But he's comfortable in the fact he didn't have any other option."

A number of children were present at the property at the time. ( ABC News )

The man lived at the house but police were unable to confirm if he was related to the children, who are all under the age of 10.

Two women also lived at the property — one woman is believed to be a housekeeper and the second woman is the mother of the children, police said.

The children were not harmed and are currently in the care of their mother.

The incident is currently being investigated by police ethical standards and a report is being prepared for the coroner.