NPR's Chitra Ragavan reports that while investigators of the TWA crash are slowed by the lack of physical evidence, FBI agents are proceeding with other areas of inquiry. In case a bomb is named as the cause, they're putting together lists of terrorist groups who could be involved, as well as lists of potential suspects. And they're looking into other potential connections, such as whether July 17--the date of the crash--could have been a meaningful anniversary date for some group.
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