Newspaper publishing giant Lee Enterprises said an ongoing cyberattack is causing disruptions across its business, and is now in its third week of outages. In a filing with the U.S. Securities and Exchange Commission, Lee said it was conducting a forensic analysis to determine if sensitive or personal data was stolen in the cyberattack.

Post-Dispatch owner says “threat actors” accessed the company network, targeting “critical applications” and stealing data.

Lee Enterprises, which owns the Quad City Times, is still working to restore core systems that briefly went offline this month from a ransomware attack.

A cyberattack has disrupted Lee Enterprises' newspapers and online sites, raising concerns about media security and national implications. Here’s what we know.