An American woman who was hospitalized after becoming ill at a resort in the Bahamas has been transferred to a hospital in Miami.

The woman was hospitalized after vacationing at the same Sandals Resort where three other Americans died of unknown causes, according to the Royal Bahamas Police Force Commissioner Paul Rolle. The woman was moved to Miami on Sunday.

The woman, who has not been identified, is in serious condition, Rolle told CNN.

"We can confirm the death of three US citizens in the Bahamas," a State Department official said in a statement. "We are closely monitoring local authorities' investigation into the cause of death. We stand ready to provide all appropriate consular assistance. Out of respect for the privacy of the families, we have nothing further to add at this time."

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Police are investigating the incident to determine if there are additional risks. Foul play is "not suspected," according to Bahamian acting Prime Minister Chester Cooper.

The identities of the people who died will be released on Monday after "official identification" is complete, Cooper said.

Resort staff alerted police around 9 a.m. Friday that two men and a woman were found unresponsive, according to press statements from the police. Police entered one villa and found a "Caucasian male lying on the ground unresponsive." They were then directed to a second villa, where they found the second man "slumped against a wall in a bathroom unresponsive." The woman was "found in a bedroom on a bed."

The two people in the second villa showed signs of "convulsion," according to police, but none of the deceased had signs of trauma on their bodies.

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"Nothing is more important to Sandals Resorts than the safety of our guests," the resort said Saturday in a statement. The resort said it would do all it can to support the investigation and the guests' families.