Eight of the victims were minors, the UNGRD said.
Landslides are common in Colombia due to the mountainous terrain, frequent heavy rains and informal construction of houses.
The country will focus on reforestation to avoid further tragedies connected to landslides in the future, Environment Minister Susana Muhamad said in a message on Twitter.
Pueblo Rico Mayor Leonardo Fabio Siagama told reporters that bodies were being brought to a sports stadium in the town.
The bus was traveling from Cali, Colombia’s third largest city, to the municipality of Condoto, in Choco province.
Colombia has been affected by an unusually heavy rainy season, blamed on the La Nina weather phenomenon.
Events linked to heavy rains have killed more than 216 people and left 538,000 homeless so far in 2022, according to government statistics. Another 48 people are still missing across the country, the figures show.
The country’s most recent large landslide killed more than 320 people in the city of Mocoa in 2017.
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