The FBI and U.S. Centers for Disease Control and Prevention (CDC) have joined the probe into the deaths of three Americans at a resort in the Dominican Republic.
Teams with the CDC and the World Health Organization were conducting tests on June 6 at the Grand Bahia Principe La Romana and the Luxury Bahia Principe Bouganville, hotels that are situated at the same resort in the Caribbean country.

Day and Holmes were found dead in their room at the La Romana hotel on May 30. Officials said autopsies indicated they died of respiratory failure and pulmonary edema, or excess fluid in the lungs, but noted that toxicology results are pending.
Results for the tests done by the CDC and other teams should be back by June 10, Carlos Suero, spokesman for the Ministry of Public Health, told CNN.
"We are awaiting the results, especially in regards to the tragic death of the couple from Maryland," a spokeswoman for the Dominican Republic Ministry of Tourism told Fox. "We want these tests and investigation to be carried out carefully and professionally."

Multiple other Americans have come forward after the three deaths were reported to say they or their family members had gotten sick or died in the country within the last year.

They were at the Hard Rock Hotel & Casino, where Wallace died in April. McCoy said that her husband was in good health apart from taking pills for high blood pressure, even being cleared by a doctor in the United States before traveling.
“I started seeing all these other people that were dying of the same exact causes, which made me start to second guess. I no longer feel like my husband died of natural causes,” McCoy said.
“Violent crime, including armed robbery, homicide, and sexual assault is a concern throughout the Dominican Republic. The development of a professional tourist police corps, institution of a 911 system in many parts of the country, and a concentration of resources in resort areas means these tend to be better policed than urban areas like Santo Domingo,” the State Department stated.
“The wide availability of weapons, the use and trade of illicit drugs, and a weak criminal justice system contribute to the high level of criminality on the broader scale.”
