FBI toxicology results show the deaths of three American tourists in the Dominican Republic, including a local woman, were due to natural causes.

A State Department official says the deaths were unrelated, isolated incidents.

Among them was Miranda Schaup-Werner of Whitehall Township, who reportedly died in her hotel room in May after drinking something from the mini-bar.

The bureau opened an investigation after at least nine U.S. tourists died there over the course of a few months.