Lockheed Martin, one of the world's largest defence contractors, was on Sunday investigating the source of a major cyber-attack one week ago against its information network, the company said. "Lockheed Martin detected a significant and tenacious attack on its information systems network," the company said in a statement late Saturday night.
The company said the cyber-assault took place on May 21, and that quick action by its security team successfully repelled the attack. "No customer, program or employee personal data has been compromised," the company statement said, adding that federal authorities had been notified.