Jaguar Land Rover (JLR) says it now believes that "some data has been affected" in the cyber attack on the company last week.
The British car maker shut down operations when it spotted the attack last Tuesday, and its staff have been told to stay at home since .
Sky News understands it will now be at least Monday next week before production staff can return to their jobs.
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In an update on Wednesday, a spokesperson said: " Since we became aware of the cyber incident, we have been working around the clock, alongside third-party cybersecurity specialists, to restart our global applications in a controlled and safe manner.
"As a result of our ongoing investigation, we now believe that some data has been affected and we are