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(CNN) -- Eleven people plus a gunman were dead and 31 wounded after a shooting Thursday at a soldier-processing center at Fort Hood, Texas, officials said.
The gunman who was killed was a soldier, Army Lt. Gen. Bob Cone said. Two other soldiers who were detained have been released, but another person of interest is in custody, said Christopher Haug, chief of public affairs at Fort Hood.
The slain gunman was identified as Maj. Nidal Malik Hasan, 39, a law enforcement source told CNN. Licensed in Virginia, Hasan was a psychiatrist who previously worked at Walter Reed Army Medical Center but more recently was practicing at Darnall Army Medical Center at Fort Hood, according to professional records.
Hasan was scheduled to be deployed to Iraq, "and appeared to be upset about that," Sen. Kay Bailey Hutchison, R-Texas, said.
"I think that there is a lot of investigation going on now into his background and what he was doing that was not known before," Hutchison said.
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