Death toll in Puerto Rico from Hurricane Maria officially raised to 2,975 from 64
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WATCH: An independent study found nearly 3,000 people died in Puerto Rico following the hurricane in September 2017.

Using a study from a team of independent researchers, officials in Puerto Rico said they're raising the official death toll from Hurricane Maria to 2,975 from 64.

Researchers have determined that an estimated 2,975 people died from September 2017 through the end of February 2018. The independent study, from George Washington University's (GWU) Milken School of Public Health, was commissioned by the Puerto Rican government.

Graves destroyed during Hurricane Maria at a cemetery, in Lares, Puerto Rico Feb. 8, 2018, months after the the island was hit.

At a press conference Tuesday in San Juan, Gov. Ricardo Rossello announced he would be raising the island's official estimate to match that of the study.

Rossello called the announcement "painful" and said it's a time for Puerto Ricans to mourn and reflect.

The GWU report also showed that the risk of dying in the aftermath of Maria was 60 percent higher for those in the poorest communities and 35 percent higher for those aged 65 or older.

"There are huge inequalities in Puerto Rico that were brought up by the hurricane," said Carlos Santos-Burgoa, one of the principal investigators of the study.

The estimate of 2,975 was determined using a mathematical model based on historical patterns, with adjustments made for age and sex, researchers said. That sum is more than 4,500 percent higher than the original estimate of 64.

Destroyed communities are seen in the aftermath of Hurricane Maria in Toa Alta, Puerto Rico, Sept. 28, 2017.

President Donald Trump, who visited Puerto Rico in the days following the storm, initially told a crowd of Puerto Ricans to be "very proud of all of your people" because the death toll was so low.

"If you look at a real catastrophe like Katrina, and you look at the tremendous hundreds and hundreds and hundreds of people that died ... 16 people versus in the thousands," he said. Hurricane Katrina claimed more than 1,800 lives, according to the National Hurricane Center.

On Wednesday, a day after the announcement that thousands of lives were lost to Hurricane Maria, the president remained steadfast that his administration did a "fantastic job." The storm was a "tough one," Trump said, but he blamed the level of destruction on the island's geography and faulty electrical system.

"Puerto Rico was actually more difficult because of the fact it's an island," Trump said. "With Texas, you're land-based, with Florida it was land-based ... I only hope they don't get hit again."

In a statement to ABC News, San Juan Mayor Carmen Yulin Cruz strongly disagreed with the president's characterization.

“President Trump continues to demonstrate his inability to understand what his job in this crisis was all about: This was never about him, this was never about politics, this was about saving lives," Cruz wrote. "His lack of sensibility is beyond offensive -- 2,975 people died because of his inability to get the job done. We will never forget!”

Dr. Lynn Goldman, dean of the Milken School of Public Health, told ABC News the death rates have still not returned to the baseline, and that the deaths for the poor and elderly did not stop after the study concluded in February.

"We thought we would capture all the deaths if we looked at the period between September 2017 and February 2018, but in reality, even in February, there was still some excess deaths among the poor and the elderly," Goldman said. "It might make sense to follow through for the next six months to see when the death rates actually return to baseline."

Hurricane Maria "caused problems for people for months -- loss of electricity, issues with getting food and water, healthcare and other things people needed," Goldman added.

The GWU report also offered a blistering criticism of Rossello and his government, saying there was "inadequate preparedness and personnel training for crisis and emergency risk communication."

These factors "decreased the perceived transparency and credibility of the Government of Puerto Rico," the report said.

Rossello said he takes responsibility for what happened as a result of the passing of the storm.

"Yes, I made mistakes," he said. "We could have done things differently."

Orlando Gonzalez holds his daughter during the funeral of their neighbor Victor Ruiz Ramos in Corozal, Puerto Rico, Oct. 02, 2017. After Hurricane Maria, Ruiz used his car's battery to power the machine helping to treat his emphysema. Ruiz died on the way home from a gas station following a 35-hour wait for fuel that never came.

The governor announced the creation of a commission that will start by working off the GWU recommendations to improve public health and safety as well as the creation of a registry of people considered vulnerable to future disasters. Rossello also said the commission would update Puerto Rico's preparedness plans to endure stronger hurricanes.

A memorial at the University of Puerto Rico to commemorate the lives lost because of Maria also is planned, the governor said.

On Wednesday, Trump offered praise for the governor.

"We're still helping Puerto Rico, the governor is an excellent guy," he said. "And he is very happy with the job we've done."

Goldman said assistance provided to Puerto Rico needed to include assistance to the island's understaffed Department of Health.

The GWU team plans to conduct a second phase of the study to better understand everything that contributed to the death toll. They're looking for funding for additional phase.

Mother Isamar holds her baby Saniel at their home under reconstruction following Hurricane Maria, Dec. 23, 2017 in San Isidro, Puerto Rico. Their neighborhood remained without electricity nearly three months after Hurricane Maria made landfall.

The study's findings come after nearly a year of questions, uncertainty and political sparring over the human toll of the storm.

Cruz tweeted following the release of the study: "The # of deaths 2,975 reinforces the pain inflicted on the people of PR and the violation of our human rights. THEY WILL NOT BE FORGOTTEN."

She added in the subsequent tweet: "I am sure the small minded will now compare studies and concentrate on the difference in #s. Remember, no matter the # thousands died."

"We need to come to terms with the fact," Goldman told ABC News, "that these storms are getting bigger and there are more of them and we all need to be prepared for them."

On Tuesday, White House press secretary Sarah Sanders said the federal government will continue to support Rossello's efforts "to ensure a full accountability and transparency of fatalities resulting from last year's hurricanes -- the American people, including those grieving the loss of a loved one, deserve no less."

"We are focused on Puerto Rico's recovery and preparedness for the current Hurricane season," Sanders said.