Lockheed Martin hit by cyber attack

By LOLITA C. BALDOR | May 28, 2011 | 11:29 PM EDT

A major defense contractor says it sustained a "significant and tenacious" cyber attack but kept its secrets safe.

Lockheed Martin and the Department of Homeland Security confirmed Saturday night that the contractor had come under a cyber attack. Chris Ortman, speaking for Homeland Security, says his agency and the Defense Department are trying to determine the extent of the data breach. He says the agencies are analyzing data and working to recommend ways to address the attack and mitigate the problems.

Lockheed Martin said in a late evening statement that the company's security team detected the threat quickly and no customer, program or employee personal data had been compromised. The Pentagon said the impact on its operations is "minimal."