China and Nepal continue to grapple with the devastation left by catastrophic flooding along the Nepal-Tibet border, as rescuers search for the missing and assess widespread destruction.

The U.S. has pledged 3.5 million in flood aid for Tibet and Nepal, with the first $500,000 distributed by Catholic Relief Services. An aid worker with the group explains what flood survivors need now.

Rescue crews are struggling through blocked roads, high mountain canyons and dangerous terrain as they search for thousands of people missing in Nepal and Tibet.

Nepal officials say the death toll has continues to rise in Wednesday's floods that washed away communities in Nepal and Tibet, which is held by China. About 2,500 people are missing in both areas.

As the death toll rises from flash floods that hit the Nepal-Tibet border, experts are warning more flooding could be on the way. And, Fed Chairman Kevin Warsh is expected to give a key address today.

Hundreds of people were killed by devastating flash floods that hit the Nepal-Tibet border, sweeping away roads, bridges and entire villages. More than 1,000 people are still missing.

At least 1,500 people are missing, many of them foreign tourists, after deadly floods hit the Nepal-Tibet border, sweeping away entire villages

At least 1,500 people are missing, many of them foreign tourists, after deadly floods hit the Nepal-Tibet border, sweeping away entire villages

The death toll continues to rise after massive flash floods hit a border area of Nepal and China on Wednesday.

China's Xinhua News Agency said Thursday that mudslides in Tibet caused by a glacial collapse have left three people dead and 558 missing, while police in Nepal reported at least 162 were killed.