Hurricane Maria killed 2,975 people in Puerto Rico, according to the results of a long-awaited independent investigation commissioned by the government of the US island territory.

After nearly a year of controversy over the true toll of the 2017 monster storm, the governor of Puerto Rico said the new estimate would now be considered the official death toll.

"I'm giving an order to update the official number of deaths to 2,975," Governor Ricardo Rossello said at a press conference.

"Although this is an estimate, it has a scientific basis."

The Puerto Rican government's longstanding official death toll from Maria had been just 64.

To get a more accurate assessment, Rossello commissioned the independent study from George Washington University (GWU).

The study tracked excess deaths related to Hurricane Maria from September 2017 to February 2018, and found the toll was 22 percent higher than the number of deaths that would have been expected during that period in an average year, without such a deadly a hurricane.

"The results of our epidemiological study suggest that, tragically, Hurricane Maria led to a large number of excess deaths throughout the island," said principal investigator Carlos Santos-Burgoa, a GWU professor of global health.

"Certain groups -- those in lower income areas and the elderly -- faced the highest risk."

- 'Most rigorous to date' -

A separate study by Harvard University earlier this year estimated that around 4,600 people had died in the three months following the storm.

Authors of the latest report described it as "the most rigorous study of excess mortality due to the hurricane done to date."

It analyzed death certificates and other mortality data for six months from September 2017 through February 2018.

Excess deaths were estimated with the help of mathematical modeling that compared post-hurricane deaths to the expected number based on historical patterns, and adjusted for age, sex and migration from the island.

The team also identified flaws in the system that may have led to underreporting deaths previously, including lack of communication and poor training for doctors on how to certify deaths in disasters.

Rossello told El Nueva Dia newspaper that the findings, "in my opinion, demonstrate the catastrophe that we always warned Maria had been, and of course the insufficiency of the standard protocols that we had."

The governor said he would sign an executive order to create a committee to examine the recommendations from GWU researchers and find ways to put them into practice.

- Third costliest cyclone -

Hurricane Maria pummeled Puerto Rico in September 2017, wreaking widespread devastation and causing $90 billion in damages.

It is ranked as the third costliest cyclone in the United States since 1900.

In comparison, the death toll from 2005's Hurricane Katrina -- the costliest hurricane in US history -- was far lower, and estimated at 1,833.

The previous findings by Harvard University blamed most deaths after Hurricane Maria on interruptions in medical care due to power outages and blocked or washed out roads.

Households went for an average of 84 days without electricity, 64 days without water and 41 days without cellular telephone coverage after the storm.

Puerto Rico stopped publicly sharing its data on hurricane deaths in December 2017.

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