The rapid growth of Kathmandu, the capital of Nepal, has contributed to the massive scale of the earthquake disaster in the city, according to the head of the UN Office for Disaster Risk Reduction, UNISDR.

The 7.8-magnitude tremor struck the city on Saturday and has reportedly killed more than 5,000 people.

The UN has launched an appeal for US$415m to provide emergency relief over the next three months.

Daniel Dickinson asked the UNISDR chief, Margareta Wahlström, why the damage was so extensive.

Duration: 3’43”