The Chinese government says accusations that it was involved in cyberattacks against U.S. transportation contractors are “totally groundless and untenable.”

The U.S. Senate Armed Services Committee said Wednesday that the Chinese military stole emails, documents and log-in credentials from contractors for the U.S. Transportation Command, a network that ties civilian airline and shipping contractors together for use in times of disaster.

Contractors faced more than 50 intrusions in the year from June 2012, almost half of which were successful in planting malware in computer systems, the committee said in a declassified report.

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