Hackers attacked Baltimore and demanded ransom with Bitcoin.
The hacker request was rejected by Baltimore city officials. Currently, the city's IT department is trying to fix vulnerabilities in software security and overcome people's access to affected systems.
Information about individuals or groups of hackers behind this attack has yet to be announced. But the Baltimore city government said it had identified the name of the attack software, EternalBlue.
Previously, EternalBlue was used by hackers behind the malicious code Wannacry to perform several other attacks against Ukraine's banks, airports .