the terror group to strike in the west. >> i don't think they're capable of a large-scale attack but certainly an tae tack which could kill maim or wound hundreds of people. >> police departments in los angeles, philadelphia boston and atlanta tightening up security measures. >> we're constantly seeking to be creative to be proactive. name of the game is to be prepared. >> at the washington mall they're preparing for all possibilities. new york city taking the greatest security measures in years. the city swept for explosives even out at sea where hundreds of boaters will be watching the fireworks. snipers will be strategically placed, spotters will be inside the crowds and a hundred mobile cameras will capture the activities on land and in the air. >> there's no credible threat to this event but our operating premise is that we are the target in new york city all the time. >> on thursday within minutes of