A record 30in of rain (75cm) has already fallen on the city of Houston in the wake of Hurricane Harvey, turning roads into rivers.

But forecasters say the total rainfall could nearly double later this week.

US President Donald Trump has promised swift action to help those affected. He is due to visit Texas on Tuesday.

"Recovery will be a long and difficult road and the federal government stands ready, willing and able to support that effort," he said.

He said he was dealing with Congress on funding, warning "it's going to be a very expensive situation".

Mr Trump has also approved an emergency declaration for neighbouring Louisiana.

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BBC News