Speaking at the U.S. Embassy in Cairo, Attorney General Eric Holder said a Pentagon investigation will determine whether charges will be filed against the person or persons responsible for leaking some 91,000 secret documents to WikiLeaks.
"Whether there will be any criminal charges brought depends on how the investigation goes," he said.
The Department of Justice is working with the Department of Defense on the investigation, NPR's Soraya Sarhaddi Nelson reports.
According to the American Forces Press Service, a Department of Defense information service, "the Army's Criminal Investigation Division, also known as CID, is heading the investigation."
The leaked information, which was published on Sunday, includes information about Afghan civilian casualties and the Taliban's use of sophisticated weapons.
In his remarks, Holder criticized the leak.
"I deplore the release of classified information," said Holder. "It's not in the interest of the United States to have that kind of information leaked."
Yesterday, President Obama said the reports didn't reveal anything that wasn't already part of the debate over the war in Afghanistan, but U.S. officials worry it could hurt their human intelligence network inside Afghanistan and Pakistan.