The City of Johannesburg reported a breach of its network on Thursday night and shut down its website and all e-services, hours after receiving a bitcoin ransom note from a group called the Shadow Kill Hackers.
The hack occurred at the same time that several banks also reported internet problems believed to be related to cyber attacks.
In a message on Twitter posted just after 11pm the city said it had “detected a network breach which resulted in an unauthorised access to our information systems”.
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