Six people have died and several others are in intensive care after Melbourne's thunderstorm asthma event on Monday.
The Victorian government confirmed a sixth person had died on Sunday morning.
Five patients remain in a intensive care, three in a critical condition.
In a statement on Saturday, Department of Health and Human Services spokesman Travers Purton said the government was "now aware five deaths may have occurred as a result of conditions relating to the events".
The fifth victim, believed to be a woman, died at Northern Hospital in Epping on Friday night.
A hospital spokesman said the asthma thunderstorm led to other medical complications for that patient.
Details are yet to be released for the sixth victim.
Included in the other five are Noble Park father-of-two Clarence Leo, 35-year-old Apollo Papadopoulos, law student Hope Carnevali, 20, and Year 12 student Omar Moujalled.
The Inspector General for Emergency Management will investigate the cause of those deaths and his findings will form part of an overarching review that will examine how Ambulance Victoria and emergency services responded to and how the community was notified of the unfolding crisis.
Hospitals across Melbourne are continuing to treat four people in a critical condition and another 20 people for a variety of respiratory and related conditions.
Across Monday and Tuesday, they treated more than 8500 patients.
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