U.S. Attorney General Eric Holder said the Justice Department is examining cyber attacks that have been blamed on WikiLeaks supporters.

“We are aware of the incidents,” Holder said in Washington today. “We are looking into them.”

Homeland Security Secretary Janet Napolitano told the same news conference the U.S. is coordinating with the “private sector” on cyber issues. Separately, a Department of Homeland Security official said the agency is working with companies to limit damages from the attacks.