FEMA unprepared, understaffed, uninformed during 2017 hurricane season: Report

No tarps, no cots and fewer than 200 blue roofs.

That is what the Federal Emergency Management Administration's warehouse in Puerto Rico looked like as Hurricane Maria made landfall in Sept. 2017. The vital supplies had been siphoned off elsewhere when Hurricane Irma had slammed into the U.S. Virgin Islands, prompting a need for assistance.

In its after-action report (AAR), FEMA's leadership admits it "could have better anticipated that the severity of hurricanes Irma and Maria would cause long-term, significant damage" to Puerto Rico and the U.S. Virgin Islands.

FEMA pointed out that Puerto Rico's government has not yet achieved a level of preparedness commensurate with much of the U.S. mainland.

In the first 72 hours after Maria's landfall, FEMA had "little information" about the status of the island's infrastructure. A week after the storm, FEMA still lacked key information, including vital details like the status of more than half of the island's water treatment facilities and nearly half of the island's hospitals.

Hurricane Maria hit Puerto Rico on the morning of Sept. 20, 2017, plunging the island into complete darkness, causing $100 billion in damage and claiming the lives of countless people.

In the wake of Hurricane Irma, FEMA moved more than 80 percent of its inventory from the Caribbean Distribution Center warehouse in Puerto Rico to the Port of St. Thomas in the U.S. Virgin Islands. That left the only FEMA warehouse in Puerto Rico with no cots or tarps, less than 98,000 meals and less than 70,000 liters of water -- all as Hurricane Maria barreled towards the island.

In a letter attached to the report, FEMA Administrator Brock Long wrote that "the hurricanes also showed that governments need to be better prepared with their own supplies, to have pre-positioned contracts with enforcement mechanisms, and to be ready for the financial implications of a disaster."

The report also reveals that FEMA was using a so-called "Earthquake and Tsunami Operational Plan" developed for Puerto Rico in 2012. That plan, according to the agency, "under-estimated the actual requirements in 2017 ... the plans did not address insufficiently maintained infrastructure, which explained some of the differences between the expected and actual impacts."

The FEMA report cites the island's geographic distance from mainland U.S. as well as its fiscal pressures for its lack of critical infrastructure management and decreased funding for emergency management.

The report also pins blame on an agency they say "entered the hurricane season with a force strength less than its target, resulting in staffing shortages across the incidents." The agency needed more than 1,000 more people to hit a target set for the fiscal year.

In the aftermath of Maria, FEMA's Logistics Supply Chain Management System records that tracked much-needed food and water supplies in real time lagged because of a lack of trained personnel on the ground. Less than a fifth of the trained staff were in Texas and Florida responding to other hurricanes.

In a little over a month, the federal agency responded to three major hurricanes -- Harvey, Irma and Maria -- which did a combined $265 billion in damage. Maria represents FEMA's longest sustained air mission of food and water delivery to date.

FEMA also acknowledges that the agency's reliance on cellular and broadband communications fell remarkably short of facilitating vital communications between rescuers and survivors during some of the most consequential early days of the storm for Puerto Rico. Among a number of such issues, some of the satellite phones that were sent to Puerto Rico did not work, and many who received those phones did not know how to use them.

Department of Homeland Security Secretary Kirstjen Nielsen said in a statement: "With every response or recovery effort, we take with us lessons learned that help build a nation-wide culture of preparedness and shape the way FEMA and the emergency management community respond to and recover from future disasters."

The Puerto Rico Federal Affairs Administration released a statement late Saturday night which said things could have been done "much better" following hurricanes Irma and Maria.

"FEMA did a good job on many fronts and it's still doing [so], but it would be unwise to say there weren't mistakes. There were mistakes and many lessons to be learned. This is what the AAR is for, to help find those mistakes and that FEMA is publishing their mistakes indicates they are willing to admit them so they can learn," Carlos Mercader, the executive director for the agency tasked with representing the island's government on the mainland U.S.

San Juan Mayor Carmen Yulin Cruz, a critic of the federal government's response to the storm, said in a statement to ABC News: "The report proves what was evident to all in Puerto Rico."

"FEMA was unprepared and they lacked a sense of urgency, which resulted in neglect, which in turn resulted in the loss of lives," she said. "It is quite troubling that they were not able to adapt their operating procedures to our reality and, from what the report says -- they did not even learn from their past mistakes."

Cruz is also seeking the appointment of independent commission to "ensure those responsible are held accountable and ensure future mistakes like this do not happen again."

On Saturday, FEMA responded to media reports with a press release called "The Full Story" regarding the after-action report. The six-bullet rebuff of press accounts fires back at headlines saying the agency was "uninformed," "understaffed and was [unexpectedly] forced to rely on staff from other agencies to fulfill its mission," and that the agency admitted failure during the hurricane season.

"After-action reports are part of FEMA's standard procedures to improve the agency's ability to respond to future disasters," the statement said. "One of the biggest challenges FEMA faced was the loss of communication due to disaster impacts. FEMA has an objective in its new 2018-2022 strategic plan to improve resilient communications capabilities."