NEW YORK CITY — The possibility that New York's subway system could be the target of a terrorist attack is a constant worry for authorities, according to an AP report. The 800-mile system, which has more than 460 stations, poses a challenge to secure. The New York Police Department's security strategy works to make their "presence seen and felt in different ways," including the use of bomb-sniffing dogs, random bag searches, regular inspections of tunnels and mining for intelligence about potential plots. To read the full story, click here.