Mary Bowerman

USA TODAY Network

Two American women found dead while vacationing on an African island died from fluid in their lungs, according to Seychelles authorities.

Annie Korkki, 37, and Robin Korkki, 42, were found unresponsive in their room at the Maia Luxury Resort and Spa on Sept. 22, two days before they were scheduled to leave a resort on Seychelles, an island off the coast of Africa, according to AP.

An autopsy report, released by Seychelles authorities, stated the women died from acute pulmonary edema or fluid in their lungs, The Seychelles News Agency reported Friday. Cerebral Edema was also listed as a contributing cause for Annie Marie.

According to Mayo Clinic, acute pulmonary edema is typically caused by heart problems, but can be caused by pneumonia and exposure to some toxins and or medications.

Earlier this week, the sisters' brother, Chris Korkki told KARE-TV, the family had received very little information.

"It's all very surreal," Chris Korkki told KARE 11. "We don't know very much. Our family is still very much in shock. We're devastated."

Seychelles police spokesman Jean Toussaint told local media the women were seen drinking throughout the day and had to be helped back to their room.

He told CNN the women did not have any signs of trauma when hotel management found their bodies in the villa they were staying in the next day.

"Preliminary examination done by the police on their bodies did not show any signs of violence," Toussaint told CNN.

Police collected “various specimens” from the sisters' room and are currently investigating the incident with the assistance of the U.S. Embassy in Mauritius, according to The Seychelles News Agency.

Chris Korkki said family members are traveling to the island to find out more information and bring the sisters' bodies back to the U.S., AP reported.

He told AP the women women were adventurous and traveled often.

"They were frequent travelers both domestically and internationally," he said. "They were kind and generous and compassionate, and were wonderful people that had a positive impact on a huge number of people.

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Contributing: KARE-TV