Police identify Saudi sisters found dead in Sydney flat
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"Despite extensive inquiries, detectives have been unable to ascertain how the women died," the statement said. "However, it is believed the women had been deceased for some time prior to being located."
NSW Police detective inspector Claudia Allcroft said any information from the public could hold the key to solving the investigation.
"Detectives are interested in speaking with anyone who may have seen or who may have information about the women's movements in the days and weeks prior to their deaths -- which we believe occurred in early May," Allcroft said in the NSW Police statement.
In a statement posted on Twitter, the Saudi Consulate in Sydney said it was in contact with Australian authorities about the case. "The Consulate also expresses its sincere condolences to the family of the deceased," it said.