Hackers linked to China's government broke into computer networks of private transportation companies working for the U.S. military 20 times in one year, Senate investigators said on Wednesday.

But the probe by the Senate Armed Services Committee found that officials of the U.S. Transportation Command, responsible for moving troops and goods across the globe, were told about just two of those incidents. If a system was compromised, military officers might not have known, the panel said.

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