A man is in a serious condition after he was stabbed in the back at Ipswich, west of Brisbane.
The 29-year-old suffered multiple injuries during an argument at an apartment on Clifton Street around noon on Monday.
Police said his alleged attacker, a 40-year-old man, suffered head injuries while a 32-year-old woman who tried to intervene was cut on the hand.
The younger man was taken to Brisbane's PA Hospital in a serious condition, a Queensland Ambulance Service spokeswoman said.
The two others were taken to the Ipswich Hospital, both in a stable condition.
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Police said the three were all known to one another and the 40-year-old was in custody, but charges were yet to be laid.
