Carbon monoxide, often called the “silent killer,” has no taste, odor or color, yet prolonged inhalation of the invisible gas has been linked to the recent deaths of several American tourists traveling abroad.

Arar, 26 — all from Revere, Mass. — were found dead inside their room at the Royal Kahal Beach Resort in San Pedro on Feb. 22.

Carbon monoxide poisoning is a danger travelers need to be well aware of. Here's what you need to know to protect yourself.

Carbon monoxide is an odorless, colorless gas that takes hundreds of lives each year, and makes even more people sick.

Merely having a carbon monoxide detector is not enough if they aren’t tested regularly and replaced every few years, Charon warned

The cause of the deaths of Kaoutar Naqqad, Imane Mallah and Wafae El-Arar has been determined just over a month after they were found dead in their Belize hotel on Saturday, Feb. 22.

The Belize National Forensics Science Service executive director, Gian Cho, said Thursday that carbon monoxide poisoning killed three American women found dead while at a vacation resort there in February.

Authorities in Belize are taking a closer look at the possibility that carbon monoxide poisoning may have played a role in the deaths of three Americans last month.

Belize police originally listed their deaths as "acute pulmonary edema." While toxicology tests found no drugs in the women's bodies, fatal levels of carbon monoxide poisoning were found.