The Washington Examiner is reporting that at least five schools across the nation have been compromised by a cyberattack.

The incidents occurred between May 24 and May 31, but the Washington Post reports that schools across America were compromised by “multiple hacking groups.”

The attackers, which reportedly targeted schools that are in districts with high-tech schools and universities, targeted students with “multiple email accounts, school IDs and social media accounts,” according to a report from cybersecurity firm Palo Alto Networks.

The malware was apparently able to download additional files.

The Washington Post report comes amid an increased scrutiny over the cyberattacks that have hit schools in the past.

In February, the New York Times reported that more than 60 school districts were targeted by the hackers.