7,000 nypd officers are just one part of the enhanced measures being taken to protect the city. >> this is where everybody's got to be on their toes. complacency can set in at times but essential not in an event like this. >> in the wake of isis-inspired attacks in berlin and nice. 65 sand trucks will be placed around the city to ward off truck-style attacks. >> we live in a changing world and as i said, it can't just be about what happens in new york. >> reporter: the nypd is in constant communication with foreign department, gaining intelligence and sharing police strategy with cities abroad. in london there is added security at the changing of the guards, heavily armed police were unavoidable in berlin as they stood post behind concrete barriers at the christmas concert. czech holiday mark markets were heavily patrolled and in france a boost of 10,000 soldiers over the holiday period, adding to