Universities across the UK have been hit by a cyber attack named Janet, leaving students unable to submit their work.
According to the network's operator, JISC? (Joint Information Systems Committee), DDoS attacks began on Monday and do not appear to be stopping.
Jisc is a publicly funded body that provides computer network services to higher education and research bodies.
A statement on Jisc's Facebook page says the attacks "have resulted in reduced connectivity and disruption" and adds that "engineers are currently working to restore normal service".
JISC said it had to limit tweets as it "suspected that those behind today's DDoS attacks are adjusting their point of attack based on our Twitter updates".
It also had to close its own website for a period as it also came under attack.
Executive director at Jisc, Tim Kidd, said: "We understand the importance of connectivity to colleges, universities and other public sector organisations.
"We are doing everything in our power to ensure normal service is resumed as soon as possible, and in the meantime to minimise any disruption that users of the Janet network may be experiencing. We apologise for any inconvenience caused."
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