Two sisters from Minnesota were found dead in their hotel room on a paradise island in the Indian Ocean last week, NBC News reported.
Annie Korkki, 37 and Robin Korkki, 42, were vacationing at a $2,000-a-night luxury resort on the Seychelles island of Mahé.
They were found dead on Sept. 22 after an employee at the Maia Luxury Resort and Spa tried to wake them, according to the hotel and local officials.
"There were no marks on them whatsoever," Seychelles Tourism Minister Alain St Ange told NBC News. "They had a good time in the day and then they went to their room."
The sisters' brother and mother have traveled to the island to look for answers, St Ange said.
Their brother, Chris Korkki, told the Associated Press the family has learned nothing through official channels about his sisters' deaths.