New Orleans Mayor Latoya Cantrell has declared an emergency in the city due to the cyber attack that the city suffered on Friday, CNN reported.

Hacking attempts and suspicious activity were discovered around 5am, Kim LaGrue, head of the New Orleans information department, said at a press conference.

At around 11am, technical investigators discovered a “cybersecurity incident,” and the city’s IT department began shutting down servers and city computers as a precaution, according to the New Orleans Office of Homeland Security and Emergency Preparedness.

The city launched an investigation into the incident in collaboration with Louisiana State Police, the National Guard, the FBI and the US Secret Service.