New Orleans battered by Hurricane Ida as storm claims first victim in Louisiana

A million households without power as governor says system of levees overhauled after Hurricane Katrina will face most severe test'

• Hurricane Ida: latest updates

One person has died as Hurricane Ida, one of the most powerful storms ever to hit the US, knocked out power to all of New Orleans, reversed the flow of the Mississippi River and blew roofs off buildings across Louisiana.

Related: Hurricane Ida live updates: first death in Louisiana as New Orleans loses power