Officials say the U.S. firm Lockheed Martin, one of the world's biggest defense contractors, has sustained a major attack on its information systems network.
Lockheed Martin and U.S. defense officials have both confirmed that Lockheed Martin came under cyberattack. No immediate information was available on where the attack may have originated.
In a statement, Lockheed Martin described the attack as "significant and tenacious." It said the company's information-security team detected the attack on May 21 and took what the statement described as "aggressive actions" to protect the firm's systems and data.
The statement said that as a result of the protective action, Lockheed Martin's systems remained secure and "no customer, program, or employee personal data" was believed to have been seized by the attackers.
The U.S. Defense Department said the impact of the attack on the Pentagon was "minimal," and no adverse effects are expected.
Officials said the Defense Department and the Department Of Homeland Security were working with Lockheed Martin to determine the scope of the attack and provide recommendations to reduce further risks.
Lockheed Martin is the maker of the F-16, F-22, and F-35 fighter jets, as well as other multibillion-dollar arms systems sold worldwide.
compiled from agency reports