The retailer first learned of the security incident on March 4, and concluded that customer information was involved by March 15, the company wrote in an email to customers.

The compromised data includes names, addresses, contact information, medical details, and health insurance information. The exact number of affected clients is unclear, and it is unknown if the information has been misused.

The hospitals' IT provider, TransForm, is investigating the incident and determining if patient data was compromised. As a result of the outage, online services such as patient records and email have been affected.

The provincial Crown corporation says in a brief statement on Wednesday that its website and mobile app remain unavailable. The LCBO says its shops are open to customers as they were unaffected.

In a statement posted Monday night, SickKids says people could experience difficulties calling into the hospital as well as accessing its health education web page and its careers portal.

Some 360,000 people will receive notices that their personal information was part of the November 2021 data breach of the COVAXX system, the Ministry of Public and Business Service Delivery said in a statement Friday.

"The breach involves a risk of significant harm to your privacy," reads the letter to affected students. The letter says names, phone numbers, email addresses, dates of birth, and social insurance numbers were all included.

In a statement published to social media networks on Thursday afternoon, officials said that after "several days of investigation" it has become clear that the incident that first began on Sunday is a cyberattack.

The Scarborough Health Network (SHN), which includes three hospitals and eight satellite sites, said in a statement Wednesday its IT department first noticed "unusual activity" on its servers on January 25.

President Biden reaffirmed the U.S. threat of new sanctions against Russia in case of an escalation or invasion, to which Putin responded with a warning of his own that such a U.S. move could lead to a complete rupture of ties.