Danish police arrested at least three people today in a terror plot to kill one of the 12 cartoonists behind the Prophet Mohammad drawings that sparked an uproar in the Muslim world and in Britain two years ago, authorities said. One of the three was a Dane of Moroccan descent, and two were Tunisian. The arrests were made in pre-dawn raids in Aarhus, western Denmark, “to prevent a terror-related murder,” the police intelligence agency said. It did not say how many people were arrested nor did it mention which cartoonist was targeted. However, Jyllands-Posten, the Danish newspaper that first published the drawings on September 30, 2005, said the suspects were planning to kill its cartoonist, Kurt Westergaard, 73.