A big cyberattack hit many schools and universities in the US and Canada on Thursday.
The attack caused major problems during exam week.
Hackers targeted Canvas, a popular online learning system used by schools and colleges.
The hacking group Shiny Hunters said it was behind the attack.
Canvas Stopped Working
Many students could not open Canvas.
They could not upload homework or take online exams.
Penn State University told students that nobody could use Canvas. Some exams were canceled.
University of British Columbia warned students to log out after the cyberattack.
University of Toronto also said its system was affected.
At University of California, Los Angeles, students had trouble sending assignments online.
University of Chicago shut down part of its Canvas system for safety.
Hackers Asked for Money
Reports said the hackers sent ransom messages.
The messages asked schools to contact them to stop private data from being shared online.
Cyber expert Luke Connolly said the attack may have started earlier this week.
Government Warns About Cyber Risks
Chuck Schumer asked the government to improve cyber safety.
He warned that more online attacks could happen in the future.
Students Face Problems During Exams
Many students lost access to notes, homework, and tests.
Schools are now trying to fix the systems and protect student information.
Source: bbc
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