Thousands of traumatised survivors spent the night outdoors, afraid to return to their houses after Tuesday's 7.3-magnitude quake hit, less than three weeks after the country was devastated by its deadliest quake in more than 80 years.
Dozens of people were killed in the latest disaster, bringing the overall death toll to more than 8,200 and compounding the difficulty of reaching far-flung mountain communities in desperate need of shelter, food and clean water.
UN resident coordinator Jamie McGoldrick said Tuesday's quake had exacerbated an already desperate situation as he delivered an urgent call for more funding.
"Damaged houses will be further damaged. Houses and schools and buildings that were spared in the first one were probably affected yesterday. Roads, we know, have been damaged," he said.
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"It is extremely urgent that the donors realise that we are running against the monsoon that is coming."
Spokesman Jagdish Pokharel said the army would keep searching until it found the chopper, which was carrying six US Marines and two Nepal army soldiers when it disappeared in a remote mountainous area.
"We have been searching for the missing helicopter since early morning but have not found it yet," he said.
"They came to help us here... (and) we will continue to search for them."
"We had been focusing on relief distribution, but from yesterday our resources were deployed for rescue operations again," said Laxmi Prasad Dhakal, spokesman for the Nepal home ministry.
Dolakha and Sindhupalchowk, two of the districts worst affected by the original quake, bore the brunt of the damage caused by the fresh tremors.
The wounded -- many of them elderly -- continued to arrive Wednesday at a Norwegian Red Cross field hospital in Chautara in Sindhupalchowk, where shops remained closed and the streets empty of people.
"People have no hope left," 62-year-old shopkeeper Ripunath Nepal told AFP in Chautara. "We know that another quake is coming.