COPENHAGEN, Denmark — 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.

"There's been a lot of vandalism — they've set fire to cars, garbage containers and in some cases buildings," Deputy National Police Commissioner Michael Hoejer said. "The good news is that we've made a lot of arrests."

The reproduction of the prophet cartoon sparked protests and anger in many Muslim countries since Islamic law generally opposes any depiction of the prophet, even favorable, for fear it could lead to idolatry.

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