While the investigation into the Fort Hood shooting rampage that killed 13 people is still in its early stages, indications are that it is a "lone wolf" situation, senior law enforcement officials told CBS News correspondent Bob Orr .

Authorities said 39-year-old Maj. Nidal Malik Hasan went on the shooting spree Thursday at the sprawling Texas post. He was among 30 people wounded in the rampage and remained hospitalized Friday in a coma, attached to a ventilator. All but two of the wounded were still hospitalized and a doctor warned that "everyone is not out of the woods."

An Army medical official says Hasan has been transferred to Brooke Army Medical Center in San Antonio. Hospital spokeswoman Maria Gallegos says Hasan is in stable condition in the intensive care unit at the hospital on Fort Sam Houston outside San Antonio, about 150 miles southwest of Fort Hood.

Meanwhile, CBS News has learned that the gun used in the attack was a FN Five-Seven, a semi-automatic pistol popular with Special Operations and SWAT teams that can be used with special armor-piercing bullets.