The BBC's Ashley Semler is in Miami, where power lines have been downed by Irma.

In a news conference, Mayor Tomas Regalado said 72% of the city was without power.

Irma was seen as a major threat to Key deer - an endangered species living in the Florida Keys. CBS journalist David Sutta posted a video showing some had survived the hurricane and flooding on Big Pine Key.

The smaller-than-average species, sometimes called "toy deer", have been part of a conservation effort since 1951, when only 25 were thought to be left.

Some residents in Miami Beach and the Florida Keys are angry as police prevent them from going home.

The Miami Herald reports , externalthat the Miami Beach mayor has banned vehicles returning until Tuesday lunchtime, as roads are made cleared and made safe.

The City of Miami Tweeted, external: " For those who left #Miami, external to escape #Irma, external, Commissioner @FrancisSuarez, external says it's not safe to return yet and urges patience"

US President Donald Trump has promised a full government response to Irma.

Speaking at a ceremony at the Pentagon to remember the victims of the 9/11 attacks, President Trump said: "These are storms of catastrophic severity and we are marshalling the full resources of the federal government to help our fellow Americans."

He added: "When Americans are in need, Americans pull together and we are one country."

Image source, Getty Images

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Irma was less ferocious than many feared. Maj Richard Rand of the North Miami Beach police department puts it this way: Florida "expected a Big Mac, but got a kids' cheeseburger."

Emergency workers are working hard to repair the damage now that the worst has passed, he added.

"People want to come home, people want to get back to work, children want to get back to school."

The BBC's Luis Fajardo is travelling from Miami to Naples, which is in south-west Florida.

The damage from Irma is clear to see.

There have been 26 reported incidents of looting in Miami and police made 13 arrests, Miami Mayor Tomas Pedro Regalado said at a news conference.

"The city of Miami is in full mode of recovery," he said, adding emergency management teams were in the streets to assess the damage.

The main concern is opening up roads, where thousands of trees are down, Mr Regalado added.

More on the Pope's warning about climate change.

Speaking to reporters as he flew back to the Vatican from Colombia, he said: "If we don't go back we will go down. That is true. You can see the effects of climate change with your own eyes and scientists tell us clearly the way forward.

"All of us have a responsibility. All of us. Some small, some big. A moral responsibility, to accept opinions, or make decisions. I think it is not something to joke about."

The BBC's Ashley Semler is close to Miami's city centre.

Mosquitoes, carbon monoxide and chemicals are big post-Irma health concerns, The Washington Post says, external. They are difficulties Americans will be grappling with long after the flood waters of hurricanes Harvey and Irma have receded.

It says other, lesser known post-hurricane problems are chronic illnesses - from respiratory difficulties or infected wounds - and mental health issues affecting traumatised people.

Jacksonville Sheriff's Office officials have urged residents to "get out now" ahead of expected flooding.

An "extremely dangerous and life-threatening" flash flood emergency has been issued for Jacksonville with water levels expected to reach four to six feet above ground, according to the National Weather Service, external.

Jacksonville officials said residents should wave a white flag, external or t-shirt outside their home if in need of rescue.

The sheriff's office also said if residents couldn't evacuate they should move to a house with a second floor. "In the event of rising water, go UP not OUT," they tweeted, external.

If you are just joining us, the authorities in the US are beginning to assess the damage caused by Hurricane Irma which, though now downgraded to a tropical storm, is continuing to bring heavy rain to central Florida.

A study by the US forecaster AccuWeather , externalput the joint cost of Irma and Harvey (which hit Texas last month) at almost $290bn (£220bn). That's 1.5% of the country's annual GDP.

A huge relief operation is getting under way, and search and rescue teams are beginning to move through the worst affected areas. More than six million homes are without power in Florida as a result of damaging winds, storm surges or flooding.

Irma has killed at least 38 people and flattened thousands of homes across many Caribbean islands.

More than six million homes in Florida are currently without power, according to the latest update from the State Emergency Response Team.

That's 62% of the entire state.

Image source, EPA

Pope Francis has said the recent hurricanes should make people understand the need to address the threat of climate change. Speaking to reporters as he flew back to the Vatican from Colombia, the Pope said those who denied the science on global warming would be judged by history. He said humanity would "go down" if it did not change course on climate change, and everyone had a moral responsibility to do their part.

A crime wave has broken out on the Franco-Dutch Caribbean holiday island of St Martin, AFP reports, five days after it was devastated by Irma.

It quotes residents as saying that looting continues to take place in in Marigot, the main town on the French side of the island, despite reassurances over security given by France's Overseas Territories Minister Annick Girardin.

"But officials and people in the streets seem to have different definitions of 'security' and criticism of the state's response to the disaster is mounting on the island and in Paris," the news agency says.

"Police saw people trying to loot our store," one islander is quoted as saying. "Sometimes they're just 50m [54yds] away, but they don't do anything. They told me that people's security is the priority and that the rest is only material, that it's not important."

The National Weather Service are warning people to remain alert to flooding and strong winds.

The say Storm Irma is "still a dangerous threat".

Delta Airlines has said it will cancel about 800 flights from its Atlanta hub on Monday because of Irma, Reuters reports.

"Hurricane Irma is expected to bring to the Atlanta hub strong crosswinds that exceed operating limits on select mainline and regional aircraft," the airline said.

Delta added that it was planning to restart flights to Florida.