Hackers targeted New York City schools for the holiday hack, which the New York Police Department said targeted children in kindergarten through fourth grade.
The city’s top school board said the attack began on Dec. 11 and was “pre-determined” and “targeted” at the City Charter School in Harlem.
The district did not release a detailed description of the attack, but said it targeted children who were in kindergarten and grades 6 through 12.
“It’s a really sad day for the city of New York,” New York Gov.
Andrew Cuomo said in a statement.
“The families and students of the City of New, will not rest until they are safe from cyberattacks like this one.”
The city said in its statement that it is “working with law enforcement and state agencies to investigate the incident” and is working with state and federal officials to identify the perpetrators.
“As we know, the threats of cyberattacks are not limited to a single location,” the statement said.
“Cybersecurity is a top priority for the City.
We continue to work closely with the Department of Homeland Security to identify and disrupt these threats, and are committed to a robust and resilient cyber environment for our children, their teachers, staff, and communities.”
More: In November, the New Jersey School Boards Association said it had been in contact with the NYPD about the attack.
It added that the state’s education system had not been affected.
A spokesperson for the New Hampshire Department of Education said that while the school board was not aware of the hack, the district was “aware of the incidents and are in close contact with our community.”
The US Department of Justice said it was investigating the incident.
It said in an advisory on the matter that it was not yet clear whether the attackers were “targeting schools in the United States.”
The hack has been linked to a different ransomware attack in the US that affected thousands of computers on Tuesday.
On Monday, the FBI said that the New Orleans Police Department was also working with law-enforcement authorities to determine who was behind the attack and whether any of the victims were still alive.
In an email to Reuters, the agency said: “At this time, it is not known who is behind the attacks.
If anyone has any information that may assist us, please contact us.”