Denim company Levi Strauss & Co on Friday disclosed a cyberattack that affected certain corporate data stored on employee computers.

The incident, it said in a Form 8-K filing with the US Securities and Exchange Commission (SEC), was the result of social engineering and affected three employees’ company-issued computers.

The company says its immediate response and containment actions have resulted in the attackers’ eviction from the compromised computers.

“Based on preliminary findings from the company’s investigation, the company believes that certain corporate information was accessed and exfiltrated as a result of the incident,” Levi Strauss told the SEC.

According to the company, the investigation into the attack is ongoing, but based on the preliminary findings no customer data appears to have been stolen.