The landslide, caused by heavy rain, hit the bus on the road on Sunday between the villages of Pueblo Rico and Santa Cecilia in Risaralda province - about 230 kilometres northwest of the capital Bogota - the national agency for managing risks and disasters (UNGRD) said in a statement on Monday.

Rescuers are digging through the mud for survivors. Authorities said nine people have been rescued. One of those was a seven-year-old girl found clinging to her deceased mother, said Risaralda Governor Victor Tamayo.

President Gustavo Petro described the incident as a tragedy in a Twitter message.

"Solidarity with the families of the victims," Petro said, pledging support from the national government.

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 travelling 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 over 320 people in the city of Mocoa in 2017.

Australian Associated Press