London Drugs stores remain closed for 4th straight day after 'cybersecurity incident'

What we know about cyberattack on London Drugs David Shipley, the CEO of Beauceron Security, says that Canada has failed to take the risk of cyberattacks on health systems seriously.

Dozens of London Drugs stores in Western Canada remained closed for the fourth straight day following a "cybersecurity incident," but some services returned Wednesday.

In an update Wednesday afternoon, London Drugs said its phone lines are back up after being out of service since Monday. It added customers should call their local store or pharmacy to make arrangements, but asked those with urgent needs to visit their pharmacy in person.

Canada Post offices located within the stores are also back open and “fully operational.”

London Drugs abruptly closed all locations in British Columbia, Alberta, Saskatchewan and Manitoba after detecting the cyberattack on Sunday.

On Tuesday, the retailer said personal data may have been compromised in the incident, marking a reversal from a previous statement indicating the company had no reason to believe any such personal information had been breached.

The company said it would notify any affected individuals, in accordance with privacy laws, if its investigation determines personal information was impacted.

"Recognizing the impact these closures have had on our customers and employees across Western Canada, it remains our priority to continue working around the clock to have all stores fully operational," Clint Mahlman, London Drugs president, said in the repeated statement. "We appreciate everyone’s patience and support during this very difficult time and will provide updates as available."

London Drugs has more than 80 stores across Western Canada. As of yet, the B.C.-based retailer has provided no timeline for when its stores may reopen. However, to help those with urgent medical needs, pharmacy staff remain at London Drugs locations, the company said.

With files from CTV News Vancouver's Todd Coyne and Kaija Jussinoja