Rescue efforts across western Colombia carried into a second day on Tuesday as emergency workers dug through collapsed buildings and flattened homes, amid expectations that the death toll from the country's most powerful earthquake in decades could rise. The 7.4-magnitude earthquake tore through Colombia's coffee-growing heartland early on Monday, killing at least 224 people, according to local authorities. The quake reduced multi-storey buildings to rubble in cities such as Pereira and Cali, and cracked apart one of the towers of a historic cathedral in the city of Manizales. WATCH | Deadly earthquake strikes Colombia: Powerful earthquake strikes Colombia, killing more than 100 | Duration 2:21 A 7.4-magnitude earthquake struck western Colombia, killing more than 100 people and trapping others under the rubble of collapsed buildings. The city also bore some of the most visible destruction, with entire residential blocks reduced to piles of concrete and twisted steel.