United States authorities say family members of Australian twins shot in the head at a firing range are travelling to Colorado.
An investigation of the shooting south of Denver is continuing and no suicide note has been found, AAP reports.
One sister died and the other was critically injured during the incident.
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Since the 29-year-old women from Victoria look alike, US authorities haven't been able to determine yet which one is dead and which remains alive.
The ABC reports that Arapahoe County Sheriff Captain Louie Perea said the twins' names were not released because investigators do not know which woman was killed.
"They look very similar," Captain Perea said.
Both were in the US on cultural exchange visas.
