BOGOTA — Colombia on Wednesday declared three days of mourning for victims of an earthquake that killed 239 people, as rescuers entered what officials called the final phase of the search for survivors. Monday's magnitude 7.4 quake, the strongest to hit Colombia this century, devastated towns across the coffee-growing west, leaving at least 3,700 families homeless, according to the national disaster management agency. The government said flags would be lowered to half-staff on official buildings and at Colombian embassies abroad "in honor of all the dead." In the cities of Pereira and Cali, emergency crews labored through the night with cranes, dogs and heavy machinery in the hunt for survivors, while volunteers formed human chains to clear debris by hand. Rescuers pulled 32-year-old Daniela Largo alive from the rubble of a Pereira hotel after 35 hours trapped, offering a rare sign of hope as the window for finding survivors narrowed. "We were losing hope and then we received a call," her mother Sandra Milena Perez told AFP. A local resident heard cries for help beneath the rubble and