Nepal is still reeling from last month's devastating quake that killed more than 8,000 people and injured close to 20,000.
The U.S. helicopter was delivering aid in Dolakha, one of the districts hit hardest by both quakes, on Tuesday when it went missing with six Marines and two Nepali soldiers on board. Six Nepali helicopters and about 400 soldiers found no sign of the Marine Corps UH-1Y "Huey" in forested and rugged terrain.
"There is no positive confirmation of any sighting of the aircraft and we have no communication with them at this moment," said Marines spokeswoman Captain Cassandra Gesecki. She said there was no evidence to indicate a crash.
Roads in Dolakha were cracked and littered with large boulders, a Reuters witness said. In Suspa Kshamawati village 80 percent of the houses were completely destroyed.
Krishna Budhathoki, 40, now lives in his cattle pen. "We want to be able to build a new home before the monsoon, but there's not enough time to do so now, and how can we build during the rainy season?" he said.
The Canadian Red Cross pulled a nine-strong medical team out of Tatopani, which is on the road from Kathmandu to Tibet and was close to the epicentre of Tuesday's earthquake, citing the danger of landslides.
"When the earthquake happened, big blocks of mountain came down that took away houses," team leader Cyril Stein told Reuters from Kathmandu. "I heard the top of a mountain collapse while I was on the telephone with my team."
The field clinic, which had been treating more than 50 patients a day, was threatened by a mountain block that looked like it might break loose, he said.
In Dolakha district's capital, Charikot, other relief and military helicopters brought people wounded when buildings collapsed and landslides struck in outlying hamlets to an open-air clinic where they were treated on bloodied tarpaulins.
The helicopters alternated between evacuating people and searching for the Marines' "Huey", which lost radio contact after crew members were heard talking about fuel problems.
A Pentagon spokesman said he had nothing to verify reports that the helicopter had been found and that the aerial search would resume on Thursday.

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