A U.S. Army spokesman says the man authorities say went on a shooting spree at Fort Hood has been taken off a ventilator but still remains in intensive care at a military hospital.

Spokesman Col. John Rossi told reporters on Saturday at Fort Hood that he is not sure if Maj. Nidal Malik Hasan is able to communicate.

Hasan was shot during an exchange of gunfire during Thursday's attack. The military moved him on Friday to Brooke Medical Center in San Antonio, about 150 miles southwest of Fort Hood. Army officials have said Hasan is "not able to converse."

Thirteen people were killed and 29 others wounded in Thursday's attack at Fort Hood.