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NTSB criticizes US inspectors

Federal agency cited after bus, truck crashes

WASHINGTON — Federal accident investigators called Thursday for an inquiry into the government agency charged with ensuring the safety of commercial vehicles, saying their own look into four tour bus and truck crashes that killed 25 people raises ‘‘serious questions’’ about how well the agency is doing its job.

Federal Motor Carrier Safety Administration inspectors failed to respond to red flags indicating significant safety problems on the part of bus and truck companies involved in accidents in California, Oregon, Kentucky, and Tennessee, documents released by the National Transportation Safety Board said. Besides those killed, 83 were injured in the crashes, many of them seriously.

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