The M.T.A. Is Breached by Hackers as Cyberattacks Surge

Hackers with suspected ties to China penetrated the New York transit agency’s computer systems in April, an M.T.A. document shows. Transit officials say the intrusion did not pose a risk to riders.

A hacking group believed to have links to the Chinese government penetrated the Metropolitan Transportation Authority’s computer systems in April, exposing vulnerabilities in a vast transportation network that carries millions of people every day, according to an M.T.A. document that outlined the breach. The hackers did not gain access to systems that control train cars and rider safety was not at risk, transit officials said, adding that the intrusion appeared to have done little, if any, damage. But a week after the agency learned of the attack, officials raised concerns that hackers could have entered those operational systems or that they could continue to penetrate the agency’s computer systems through a back door, the document also shows.