US sisters Robin and Annie Korkki found dead at Seychelles …

Autopsies performed Wednesday showed Robin Korkki, 42, of Chicago, and Anne Korkki, 37, of Denver, died from acute pulmonary edema, or fluid in the lungs, police told the Seychelles News Agency.

Cerebral endema, or excess fluid in the brain, also contributed to Anne Korkki's death, the news agency reported.

No explanation was offered for the fluid build up in the women's lungs.

Resort management discovered the women unresponsive September 22 in their villa, Seychelles police spokesman Jean Toussaint said.

No visible signs of injuries were found on the bodies, he said.

The sisters were staying at the Maia resort on Seychelles' main island, Mahe.

Seychelles authorities contacted the US Embassy, Toussaint said. He declined to provide further information, citing privacy and ongoing investigations.

Calls to the US Embassy in the Seychelles went unanswered.

Worried relatives in the sisters' native Minnesota are seeking answers.

In Minneapolis, their brother told a newspaper that the family is getting no information on the case. Some family members have traveled to the Seychelles to gather details and bring the sisters' bodies home.

He said his sisters were healthy and adventurous, and loved to "experience life to the fullest." They had been posting photos on social media showing them swimming and having fun while on the vacation.

The Seychelles is a popular tourist destination because of its pristine beaches, warm water and coral reefs.

They arrived in the Seychelles on September 15 and were due to leave September 24, two days after they were found dead, Toussaint said.

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US sisters Robin and Annie Korkki found dead at Seychelles ...