The death toll after a strong earthquake that rocked western Colombia on Monday has risen to at least 20, authorities said.

In the town of Pereira, 18 people were killed and others were trapped in buildings that collapsed, Mayor Mauricio Salazar told Caracol Radio.

In Manizales, two people were killed, Mayor Jorge Eduardo Rojas said in an interview with Blu Radio.

(Reporting by Fabiola Aramburo and Luis Jaime Acosta; Editing by Daina Beth Solomon)