A major search operation resumed Thursday for a US military helicopter that disappeared with eight people on board while delivering aid to earthquake victims in Nepal, where a second major tremor has killed dozens and brought fresh misery.

The search operation has diverted resources urgently needed to help victims of the 7.3-magnitude quake that hit on Tuesday, triggering major landslides and bringing down buildings weakened in the first disaster on April 25 .

That quake killed more than 8,000 people and destroyed nearly 300,000 homes across the impoverished country.

With many of the worst-affected areas inaccessible by road, more than 1,400 people have been airlifted from quake-hit areas, most of them by Nepalese troops.

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