The couples were staying next to each other in separate villas in the same building at the Sandals Emerald Bay resort on the island of Exuma.

It was not clear if the villas had carbon monoxide detectors, and if they did, whether they were working.

A Sandals spokeswoman referred all questions to police, while Bahamian police spokesman Audley Peters said he was not able to provide the information "at this time" and did not respond to further questions.

Last month, in response to the three deaths, Sandals said it had installed carbon monoxide detectors in all Emerald Bay guest rooms, with plans to install detectors in every guest room in all its resorts.

In a statement to CBS News Tuesday evening which echoed a similar one it released about a month ago, Sandals said that authorities determined the deaths were caused by an "isolated incident in one standalone structure that housed two individual guest rooms.".

In its previous statement, Sandals said the deaths were "in no way linked to the resort's air conditioning system, food and beverage service, landscaping services or foul play.".