Danish police have arrested several people suspected of plotting to attack a cartoonist who drew a controversial caricature of the Prophet Mohammed. The target is believed to be 73-year-old Kurt Westergaard, who sketched one of 12 pictures printed by a Danish newspaper in late 2005. The cartoons led to massive and - in some cases - violent protests in the Middle East and Asia.Earlier I spoke to correspondent Jens Ringberg in the Danish capital, Copenhagen. We asked him what else he could tell us about the alleged murder plot.