Analysis of information sources in references of the Wikipedia article "Schoharie limousine crash" in English language version.
[W]e are gravely concerned that your lack of responsiveness to our requests has seriously impeded our abilities to carry out our congressionally-mandated duties to properly complete this safety investigation and potentially prevent similar accidents in the future
It is very telling that the DA has been trying to prevent the NTSB, the agency that has the most expertise in investigating transportation accidents in the world, from inspecting the vehicle.
