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>> reporter: u.s. law enforcement thwarted several terror plots in the last four weeks, including plots tied to the fourth of july weekend u.s. officials tell cnn. director james comey said the fbi has made more than ten isis related arrests in the last month. some tied to the holiday. >> they stopped the stuff trying to come at us for july 4th and now it is july 7th and 8th and they are on to the same thing. >> it included targets coast to coast and were unsophisticated with plans that included guns knives and other weapons, fitting isis' public calls to supporters to attack in any way possib...

Derailed multiple terror threats to the united states. some of them tied to the july 4th holiday. so let me bring in our cnn chief national security correspondent jim sciutto. jim, we talked about this prior to the holiday and it was made crystal clear, no specific threats ahead of the holiday weekend and now this. what do you know? >> well this basically firms up in a way and justifies that alarm that we heard in those warnings before the july 4th weekend. and we heard this a bit from the fbi director yesterday on the hill. but then following up today we were able to learn more that of the nu...

Yesterday. he said some were imminent. i said how imminent? hi said within hours. what can you tell us? >> we know these plots were fairly unsophisticated. >> by that you mean guns knives other weapons -- >> not plots that had been in the works for months and months. that doesn't give us any solace that shouldn't make us any less vigilant. it just suggests that the intelligence that we've always had that there aren't any sophisticated attacks being planned against the united states from syria and iraq seems to remain to be the case. that's why we need to take them serious lid. it doesn't take ...

Inspect director from comey say something were tied to the holiday. >> think stopped the stuff that was trying to come at us july 4th but now it's the 7th and 8th and they're on to the next things. >> reporter: they were foiled coast to coast, unfirsted, chug xlans with guns knives and other weapons, fitting isis's public calls to attack in any way possible. investigators believe that isis members overseas enabled the plots and encouraging americans to carry out attacks on u.s. soil even selecting possible targets. comey calls it crowd sourcing terrorists. senator james rich telling cnn wednes...

>> no no it doesn't come from the officers. the visiting rooms that the families come into is where majority of the drugs come in. >> so somebody's -- how do they let the families come in with heroin? >> there is no way to detect -- we send them through a metal detector so that we will eliminate guns knives that kind of thing but heroin drugs, they don't come up in a metal detector. >> well they should come up some other way, then right? they should physically go through everything they're bringing in to see if there are illegal drugs that these family members are bringing into a prison. >> th...