Toxicology reports are pending.
A U.S. State Department official said authorities have not yet established a connection between the May 30 deaths of Cynthia Ann Day, 49, and Nathaniel Edward Holmes, 63, both of Prince George’s County, Md., and the death May 25 of Miranda Schaup-Werner, 41, of Pennsylvania.
The FBI is providing Dominican law enforcement with “technical assistance with the toxicology reports,” the State Department official said.
Schaup-Werner had just checked into the Luxury Bahia Principe Bouganville, in the town of San Pedro de Macoris, and was taking pictures from her room balcony when she started to feel ill.
Less than two hours later, she was dead, local authorities said.
The bodies of Day and Holmes were found inside their room at the Grand Bahia Principe La Romana after relatives grew concerned because they had not checked out of the resort.
The hotels are located next to each other on the island’s southern coast, about 60 miles from the tourist-heavy Punta Cana area.
Dominican authorities initially did not run toxicology tests for Schaup-Werner because there were no signs of violence, said Ramon Brito, a spokesman for the National Police’s special tourism unit. After the Maryland couple was found, investigators ordered a set of tests to determine whether anything the three Americans consumed may have led to their deaths, Brito said.