"We are working closely with World Health Organization (WHO) in Nepal to provide essential medical support. We are working to rebuild the district and village level hospitals that were damaged during the earthquake," said the emergency coordinator.

In his analysis, "Shelter is one of the primary needs for the disaster-affected people. Food and medical support are other important needs after the earthquake."

He stressed that time is critical as things will get much more difficult in monsoon season, which is only 30 days away.

"We have learnt lesson from the Ebola crisis in Liberia and we are preparing for all kinds of possible health hazards. Water and sanitation, another concerned aspect will be addressed by the coming month," said Ragan, who has worked for some disaster affected countries.

The official worried that the development process which was taking its pace will be halted and need more time to recover from the disaster.

He believed that through international cooperation Nepal could overcome challenges. "It will be really difficult time for the Nepal government but UN agencies together with Nepalese and Chinese governments will be able to handle this situation."

"We have mobilized more than 100 experts who have already worked in crisis all over the world," said Ragan, adding that Executive Director of the WFP Ertharin Cousin had concluded her visit to earthquake-affected regions in Nepal and called for urgently-needed relief funds days ago.

WFP has provided food materials to 200,000 people through its partner local authorities and has dispatched sufficient amount of food to half a million people, he said.

The UN agency has a three-month plan to provide food to 1.3 million affected people.