FORT HOOD, Texas (AP) — In retrospect, the signs of Maj. Nidal Malik Hasan's growing anger over the U.S. wars in Iraq and Afghanistan seem unmistakable. But even people who worried his increasingly strident views were clouding his ability to serve the U.S. military could not predict the murderous rampage of which he now stands accused.

In the months leading to Thursday's shooting spree that left 13 people dead and 29 others wounded, Hasan raised eyebrows with comments that the war on terror was "a war on Islam" and wrestled with what to tell fellow Muslim solders who had their doubts about fighting in Islamic countries.

"The system is not doing what it's supposed to do," said Dr. Val Finnell, who complained to administrators at a military university about what he considered Hasan's "anti-American" rants. "He at least should have been confronted about these beliefs, told to cease and desist, and to shape up or ship out."

Finnell studied with Hasan from 2007-2008 in the master's program in public health at the military's Uniformed Services University of the Health Sciences in Bethesda, Md., where Hasan persistently complained about perceived anti-Muslim sentiment in the military and injected his politics into courses where they had no place.

"In retrospect, I'm not surprised he did it," Finnell said of the shootings. "I had real questions about what his priorities were, what his beliefs were."

Hasan, who was shot by civilian police and taken into custody, was in intensive care but breathing on his own late Saturday at an Army hospital in San Antonio. Officials refused to say if he was talking to investigators.

At least 17 victims remained hospitalized with gunshot wounds, and nine were in intensive care late Saturday. On Sunday, numerous church services honoring the victims were planned both on the post and in neighboring Killeen.

Military criminal investigators continue to refer to Hasan as the only suspect in the shootings but won't say when charges would be filed. "We have not established a motive for the shootings at this time," said Army Criminal Investigative Command spokesman Chris Grey.

A government official speaking on condition of anonymity because the person was not authorized to discuss the case said an initial review of Hasan's computer use has found no evidence of links to terror groups, or anyone who might have helped plan or push him toward the shooting attack. The review of Hasan's computer is continuing, the official said.