With a siege on the Gold Coast nearing its 24th hour, police say they are remaining patient and continuing to talk to the man involved.
The 31-year-old, who is alone, is threatening to blow up gas bottles in the house at Upper Coomera.
Police, who were called to the home at 7pm (AEST) on Wednesday night, have used a robot to smash windows to let fresh air in.
Senior Sergeant Ash Dubbelman wouldn't confirm if the man, who is known to police, was armed.
"He does have access to certain things in the house, which I can't tell you about right now," he told reporters.
"We're in contact with him and our goal here is to ensure his safety.
"He does have gas bottles at the house ... but that's all I can say on that."
The alert was raised by one of the man's relatives who reported a violent disturbance.
Sgt Dubbelman said police would not be rushed.
"It takes as long as it takes to get a safe resolution."
Special Emergency Response Team officers and emergency crews remain on the scene.
Residents of Hart Street, who were evacuated on Wednesday night, have still not been allowed to return to their homes.
"While there's a threat of harm to them or we've got a concern for their safety they will remain evacuated."
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