BOGOTA, Colombia (AP) -- Incessant weekend rains triggered flooding and mudslides that killed at least 21 people, including seven who died when a truck was swept away, officials said Monday.

The cargo truck with 14 passengers aboard was crossing a bridge in southern Putumayo State on Sunday when the San Miguel river rose up and carried it downstream. The bodies of seven passengers were found, and the others remained missing, said the state police chief, Col. Daniel Ruiz.

Twelve people died under torrents of earth in Pasto, capital of southern Narino State, national disaster relief coordinator Eduardo Jose Gonzalez told The Associated Press.

The other two deaths were in Putumayo and Santander states.

Televised images showed residents in several affected areas paddling down streets in canoes or wading in knee-deep, muddy brown water.

Hundreds of families will have to be relocated, Gonzalez said. Meteorologists predicted more heavy rains ahead.

Flooding and mudslides commonly cause deaths in Colombia, where poor people place homes on riverbanks, cliffs or at the foot of deep ravines.