Pentagon still seeking identity of document leaker

WASHINGTON (AP) - A Pentagon spokesman says the military has launched "a very robust investigation" into the leak of Afghanistan war secrets but doesn't know who's responsible.

Geoff Morrell tells CBS's "The Early Show" the dissemination of over 90,000 documents detailing U.S. strategy, and information about targets and war partners, including Pakistan, poses a substantial hazard to American fighting forces in the wartorn country.

Morrell says the document drop "involves secrets that should not be disseminated into the public domain and could potentially endanger our operations and our forces in Afghanistan." He says that even most recent of the leaked documents "is at least six months old by now."