George W Bush returns to New Orleans to mark 10th anniversary of Hurricane Katrina

Former US President George W Bush has returned to New Orleans on the 10th anniversary of Hurricane Katrina.

Bush's administration was widely criticised for its slow response to the disaster, which killed more than 1,800 people and caused nearly £100 billion in damage - making it America's costliest natural disaster.

Katrina was the third-strongest hurricane ever in the United States. Ithit New Orleans, Louisiana on 29 August in 2005.

The Category 3 storm flooded 85 percent of the city mostly below sea level, after its dated flood defences failed in more than 50 places.

Bush marked the anniversary at Warren Easton Charter High School, where he also spoke a year after the storm.

Bush picked Warren Easton as an example of the city's fighting spirit.

The school was badly flooded by the hurricane. When Warren Easton reopened in 2006, nearly every student who attended was considered "homeless" because they lived in trailers provided to hurricane victims or slept on couches, school officials said.

He was accompanied by his wife, Laura, whose charity helped rebuild the school.

President Obama has also visited New Orleans to mark the anniversary.

He said the city is "moving forward" and "building a better future".