One neighbor, Patricia Villa, said Maj. Nidal Malik Hasan came over to her apartment Wednesday and Thursday and offered her some items, including a new Quran, saying he was going to be deployed on Friday.

Authorities said the 39-year-old Hasan went on a shooting spree later 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 injured were still hospitalized; all were in stable condition.

Investigators were trying to piece together how and why Hasan allegedly gunned down his comrades in one of the worst mass shootings ever on an American military base.