Officials wouldn’t say when the cyberattack occurred or what specifically was targeted due to security concerns, however a Metrolinx spokesperson said it happened “fairly recently.”

North Korea has been linked to several recent cyberattacks. But what's in it for them?

U.S. Ambassador Nikki Haley accused North Korea on Tuesday of intimidating the entire international community with its nuclear program, military ability and cyberattacks, and said any country that doesn't implement U.N. sanctions is supporting Pyongyang's actions.