LISBON, Nov 5 (Reuters) - A bus crashed into a ravine in central Portugal on Monday, killing 13 people, emergency services said. Another 25 people were injured in the accident and taken to hospital, a spokesman at the civil protection authority said. The bus and a car collided on a motorway, according to a spokesman for the traffic brigade of the national guard. The car also skidded into the ravine. Portugal has one of the highest road death rates in western Europe. (Reporting by Carlos Pontes, writing by Axel Bugge, editing by Matthew Tostevin)