At least 18 people were killed in Guatemala on Saturday, including a dozen on a bus that was buried in a landslide, as heavy rains lashed the Central American nation and southern Mexico.

A dozen people died when the bus they were traveling on was suddenly engulfed by mud around 8 a.m. on the Inter-American highway 50 miles outside of the Guatemalan capital, emergency workers said.

Another six people were killed in separate incidents, Guatemalan President Alvaro Colom told reporters.