Earlier Monday, a U.S. military plane carrying relief supplies and a contingent of Marines left the Philippine capital en route to the country's typhoon-devastated eastern seaboard.
The C-130 left Manila's Vilamor air base loaded with bottled water, generators wrapped in plastic, a forklift and two trucks.
It was the first American relief flight to the region, where thousands are feared dead and tens of thousands more homeless as a result of Friday's typhoon.
The flight was headed for Tacloban, a city badly hit by the storm and in desperate need of assistance.
USAID said at the weekend it sent an emergency response team in and around Ormoc, the second-largest city in heavily affected Leyte Province. It found that 80 to 90 percent of housing in the city has been damaged or destroyed, and that debris and downed power lines continue to block road access to affected populations.
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Associated Press writer Matthew Pennington in Washington, D.C., contributed to this report.