The US Department of Health and Human Services was reportedly hit with a cyberattack Sunday night, Bloomberg first reported.

The attack was reportedly meant to slow down the agency's computer systems amid its response to the spread of COVID-19.

HHS said in a statement Monday that it was investigating "a significant increase in activity" on its cyber infrastructure.

There's no evidence that the attackers were successful in hampering HHS's systems.

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As the US ramps up its response to the spread of COVID-19, the Health and Human Services Department was hit with a cyberattack, according to a new report from Bloomberg.

The cyberattack reportedly aimed to slow down HHS computer systems Sunday night, but was unsuccessful in doing so. The attack attempted to flood HHS servers with millions of requests over the course of several hours.

An HHS spokesperson confirmed in a statement to Business Insider that it is investigating a "significant increase in activity" on its cyber infrastructure Sunday night, adding that its systems have remained fully operational.

"HHS has an IT infrastructure with risk-based security controls continuously monitored in order to detect and address cybersecurity threats and vulnerabilities," HHS spokesperson Caitlin Oakley told Business Insider. "Early on while preparing and responding to COVID-19, HHS put extra protections in place. We are coordinating with federal law enforcement and remain vigilant and focused on ensuring the integrity of our IT infrastructure."

HHS Secretary Alex Azar said during a White House press briefing Monday afternoon that HHS did not yet know the source of the cyber attack.

"The source of this enhanced activity remains under investigation so I wouldn't want to speculate on the source of it," Azar said. "But there was no data breach and no degradation of our function to be able to serve our core mission."

Following the attempted intrusion, federal officials reportedly became aware that false information was being circulated. The false-information campaigns were related to the hack, but no data was reportedly stolen from HHS systems.

The National Security Council tweeted Sunday night that there were false rumors circulating about a national quarantine, calling the rumors "FAKE."