The inquiry Scrutiny attributed Causation the blade fracture to metal fatigue , caused Causation by heavy vibration in the newly upgraded Cause_to_make_progress engines , which had been tested Testing only in the laboratory and not under representative flight conditions .

The report cast doubt on the government 's conclusion that Ivins was the perpetrator , finding Know that the type of anthrax used in the letters was correctly identified Check as the Ames strain of the bacterium , but that there was insufficient scientific evidence for the FBI 's assertion that it originated Coming_to_be from Ivins 's laboratory .

On September 17 , police arrested Arrest a suspect , Raymond J. Clark III , a Yale laboratory technician who worked Employment in the building .

unk was carried out Action by the lawrence livermore radiation laboratory and the el paso natural gas company , with funding from the atomic energy commission .

due in part to flights made Building by the national hurricane research laboratory , hilda became Becoming one of the most well-documented storms meteorologically in the atlantic .