Canadians who go abroad to join militant groups such as Islamic State pose a threat on their return home and could use their foreign contacts to set up networks in Canada, the country's intelligence director said on Saturday. Michel Coulombe, director of the Canadian Security Intelligence Service, wrote in a Globe and Mail article that "well over 100 Canadians," both men and women, have left the country to join groups such as al-Qaeda and al-Shabaab. "How many are coming back to Canada more radicalized than when they departed? "And, most importantly, will they use their terrorist training to attempt violent acts here in Canada?