tracking signal went dark. jim sciutto, they're not ruling on the terror. >> no, the clues on the flight have been changing so rapidly and as those clues change and new information comes in, intelligence agencies are reacting, chasing down the leads to see if there are any evidence of a terror link. so far they haven't found that evidence, but as you say, they are not ruling it out. and as cia director john brennan was giving a talk in washington, i learned for the first time about this transponder being turned off. so i asked him about that to see if it increased his fears. here's what he had to say. >> there is information that the transponder was turned off and that it continued to fly, made that turn after the transponder was turned off. and if that information gives you anymore indication or suspicion that it was an act of terror? >> on this issue of the transponder, there are a number of very curious anomalies about