Hanoi, April 1 -- The United Nations and international relief agencies reported that they are still unable to determine the full extent of destruction from the earthquake that struck Myanmar on March 28, warning the disaster could worsen hunger and disease outbreaks in a country where nearly 20 million people are in need of humanitarian assistance before the quake.

The World Health Organisation (WHO) said it has reports of three hospitals destroyed and 22 partially damaged among more than 10,000 buildings collapsed or severely devastated in central and northwest Myanmar.

However, according to the International Rescue Committee, the true scale of devastation remains unclear at this stage, with unverified reports that 80% of structures in...