India, Aug. 12 -- Rescue crews dug through mountains of shattered concrete in western Colombia on Tuesday, racing to find survivors after a powerful earthquake killed more than 250 people, according to estimates from local authorities. Families waited beside the rubble for signs of life. The 7.4-magnitude earthquake, the most powerful to strike the South American country in decades, tore through Colombia's coffee-growing heartland early on Monday, leaving apartment blocks, homes, schools and health centers cracked, leaning or flattened. Nearly 100 aftershocks were registered as of Tuesday morning. Separate reports from affected cities put the death toll at 254 on Tuesday morning, with 101 people killed in Pereira and 95 in Cali, the country's third-biggest city.P9...