"According to new estimates following the most recent flooding in Sindh... at least 10 million people are currently without shelter," said Maurizio Giuliano, the Office for the Coordination of Humanitarian Affairs spokesman.
He said the floods in Pakistan had become "one of the worst humanitarian disasters in UN history, in terms of number of people that we have to assist and also the area covered."
Giuliano's assessment was echoed by Valerie Amos, the new UN humanitarian chief, who arrived in Pakistan Tuesday.
"The floods here in Pakistan have affected almost 21 million people -- it is one of the biggest humanitarian crises the world has seen," said Amos, who takes over from UN John Holmes.
River defences in Pakistan's flood-hit south were bolstered Tuesday in a bid to save two towns from catastrophic flooding, six weeks after monsoons caused devastating floods in the country's worst disaster in living memory.
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A woman displaced by flooding looks at her destroyed home in Kharak village, Punjab province, Pakistan. …