What immediate security measure did IBM take after the breach was discovered?

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IBM revoked access to the compromised testing system to stop further unauthorised entry.
After the breach involving the Singapore Land Authority and an IBM-managed cloud testing environment was discovered, IBM revoked access to the compromised system. The stated purpose of this immediate step was to prevent further unauthorised entry into the affected environment.
Access was removed from the compromised system
IBM took the immediate security measure by revoking access to the system that had been compromised. This action was carried out specifically to block additional unauthorised access after the incident came to light.
The step targeted the affected environment rather than live services
The compromised dataset and testing environment were separate from SLA’s live operational systems used for property transactions. SLA said property ownership and lodgment records in the STARS and eLodgment Systems remain secure, while IBM’s access revocation focused on the testing environment that had been exposed.
Investigation and follow-up notifications began alongside the measure
SLA began notifying affected individuals and advising them on assistance measures as a precaution. At the same time, SLA said it was working with IBM, Singapore’s Government Technology Agency, and the Cyber Security Agency of Singapore to investigate and implement remedial steps.

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What immediate security measure did IBM take after the breach was discovered?

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