VALPARAISO, Chile: Firefighters backed by police and soldiers spent a third day on Monday (Tuesday in Manila) battling a massive blaze that has killed 15 people and ravaged a huge swath of Chile’s historic port of Valparaiso. It could be yet another two days before they succeed in extinguishing the fire, whose cause is under investigation, officials warned. So far, the inferno has consumed 1,140 hectares (2,817 acres) and 2,500 homes, leaving 11,000 homeless, according to Interior Minister Rodrigo Penailillo. Some who refused to leave their homes died when the flames swept through. Hardest hit have been Valparaiso’s poorer neighborhoods, perched precariously on the coastal city’s tinder-dry hillsides, where dwellings built mostly of wood with tin roofs quickly became engulfed.