Groups of youths torched schools and cars in a sixth consecutive night of violence across Denmark, mostly in immigrant neighborhoods, police said Saturday. Forty-three people were arrested. The spate of vandalism started last weekend, and some believe it intensified with the reproduction of a cartoon of the Prophet Muhammad in Danish newspapers Wednesday. The unrest spread across Denmark, with youths torching dozens of cars and buildings and lobbing rocks at police and firefighters in Copenhagen, Aarhus, Ringsted, Slagelse and other cities, officials said. Police said they were not sure what triggered the unrest. Some observers said immigrant youths were protesting...