By Paul Cruickshank and Tim Lister, CNN (CNN) – Mohammed Merah is the sort of radicalized individual who makes Western counterterrorism officials very apprehensive: someone who is determined, trained, living legally in Europe or the United States and operating alone. One of dozens (perhaps hundreds) of militants either unknown to authorities or suspected of plotting a terrorist attack but … Continue reading French killings refocus fears on 'solo' acts of terror