Samples from the three Americans found dead at a Bahamas resort have been sent to a lab in the United States for research.

Law enforcement reported Monday that they had gathered samples from all of the people affected by an unidentified malady and sent them to a laboratory in Pennsylvania. The three reported feeling sick on Thursday and were found dead on Friday.

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“The pathologist has extracted samples from all of the persons, and our forensic scientists have collected those samples for examination," said Commissioner of Police Paul Rolle on Monday, according to the Nassau Guardian. “We are actively engaging a lab in Philadelphia, Pennsylvania … to assist us with expediting the toxicological examinations of all of these samples. Once those examinations are done, our pathologist would be able to provide us with an official report as to the exact cause of death and help us to determine exactly what has happened."

"Our forensic scientists have also collected samples from both of the rooms and the properties of the Sandals hotel in Exuma to determine whether or not any contaminants are present," he added.

Rolle confirmed that the four affected people had reported to the same health center on Thursday, complaining of nausea and other symptoms. Investigators are looking into what the victims ate during their stay at the resort.

Law enforcement identified the victims Monday as Michael Phillips, 68, Robbie Phillips, 65, and Vincent Chiarella, 64. Donnis Chiarella, Vincent's wife, was hospitalized but is in stable condition after being airlifted to the U.S. on Sunday.

The Chiarellas' son said his father was found dead on the floor and that his mother was unable to move due to swollen limbs, according to ABC News. They were at the resort celebrating an anniversary.

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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." Police 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 people had signs of trauma on their bodies.