FORT HOOD, Texas — There was the classroom presentation that justified suicide bombings. Comments to colleagues about a climate of persecution faced by Muslims in the military. Conversations with a mosque leader that became incoherent.

Some who knew Nidal Malik Hasan when he was a student said they saw clear signs the young Army psychiatrist — who authorities say went on a shooting spree at Fort Hood that left 13 dead and 29 others wounded — had no place in the military. After arriving at Fort Hood, he was conflicted about what to tell fellow Muslim soldiers about the fighting in Iraq and Afghanistan, alarming an Islamic community leader from whom he sought counsel.

"I told him, 'There's something wrong with you,' " Osman Danquah, co-founder of the Islamic Community of Greater Killeen, told The Associated Press on Saturday. "I didn't get the feeling he was talking for himself, but something just didn't seem right."

Danquah assumed the military's chain of command knew about Hasan's doubts, which had been known for more than a year to classmates in a graduate military medical program. His fellow students complained to the faculty about Hasan's "anti-American propaganda" but said a fear of appearing discriminatory against a Muslim student kept officers from filing a formal written complaint.

"The system is not doing what it's supposed to do," said Dr. Val Finnell, who studied with Hasan from 2007-08 in the master's program in public health at the military's Uniformed Services University of the Health Sciences. "He at least should have been confronted about these beliefs, told to cease and desist, and to shape up or ship out."

Military criminal investigators continued late Saturday to refer to Hasan as the only suspect in the shootings, declining to 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.

But Hasan's family described a man incapable of the attack, calling him a devoted doctor and devout Muslim who showed no signs that he might lash out with violence.

"I've known my brother Nidal to be a peaceful, loving and compassionate person who has shown great interest in the medical field and in helping others," said his brother, Eyad Hasan, of Sterling, Va., in a statement. "He has never committed an act of violence and was always known to be a good, law-abiding citizen."