significant developments tonight in the attempted new york terror bombing. this is new since the start of our program. according the a senior counterterrorism official with direct knowledge and involved in the times square car bomb investigation, officials are shifting focus to whether the individual who drove the suv had international connections. part of the investigation is exploring any connection or inspiration by an international group. also a counterintelligence official tells cnn they can't rule out the possibility that a terrorist sleeper cell is behind this attack. a former member of the new york city police bomb squad also tells us the bomb had, quote, no known signature, meaning it wasn't built in a way used in the past by known terror organizations. cnn national security contributor fran townsend is standing by. just before the break, you heard senator joe lieberman of the senate security committee said