you can scan a general area. >> they're deployed all the time. more crucial now you have large masses of crowds going to certain area. more detection capability in that area. >> these boats as well as from the air and even on the ground these radiation detection systems will be in place. you have officers that will have a little monitor on their belts to pick up the radiation. part of the technology we'll be seeing tonight and as we continue with the heightened security threat. it's important to emphasize there is no credible specific threat to new york or any other july 4th celebration around the country. there is a heightened sense of really making sure that you're vigilant. if you see something, say something. it's said over and over again. this weekend particularly officials are really asking people to be vigilant. >> it's a top priority. thank you. some progress in vienna with diplomats are trying to hammer out a deal with iran on its nuclear program. leaders from six countries