Hurricane Ida has killed one person in Louisiana and left people without electricity in the state's New Orleans city. People living on the coastal lines have reported flooding and the officials have issued warnings of flash floods.

Hurricane Ida, which moved into Mississippi on Monday, made landfall along the southeastern Louisiana coast as a Category 4 storm. Deputies with the Ascension Parish Sheriff’s Office confirmed the death of an unidentified person due to a tree that fell at a home in Prairieville outside Baton Rouge.

Hurricane Ida causes catastrophic damage across Louisiana, New Orleans

Here is what we know about the hurricane:

1. Thousands of people are without electricity and the city has become more vulnerable to flooding with the rising ocean swamping the barrier island of Grand Isle.

2. More than 2 million people living in and around New Orleans and Baton Rouge are under threat.

3. Louisiana Gov. John Bel Edwards said rescue crews would not be able to immediately help those who were stranded.

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4. Entergy, New Orleans power supplier, confirmed that the only power in the city was coming from generators, the city’s Office of Homeland Security & Emergency Preparedness said.

5. The Coast Guard received more than a dozen reports of breakaway barges in Lake Pontchartrain.

6. Hospitals, already stretched to the limit because of a surge in COVID-19 cases, are also now fighting the impact of Hurricane Ida.

7. President Joe Biden has assured federal support in the region for “as long as it takes.”

8. Governor Edwards said Ida, which had gathered force on its approach through the warm waters of the Gulf, could be the most powerful storm to hit the state since 1850.

9. The White House said that federal agencies had deployed more than 2,000 emergency workers to the region.

10. Dozens of shelters with room for at least 16,000 people have been prepared by local authorities, the Red Cross and other organisations.