UPDATE 1:13 a.m.: WASHINGTON (AP) -- A training director at Walter Reed Medical Center says the man suspected of a shooting rampage that left 12 dead at Fort Hood, Texas, had some "difficulties" while he was an intern.

Dr. Thomas Grieger says Nidal Malik Hasan required counseling as a medical student because of problems with patients, but he didn't offer details of the issues.

He described Hasan as a "mostly very quiet" person who never spoke ill of the military or his country. He was at the center pursuing his career in psychiatry.

Law enforcement officials say he came to their attention at least six months ago because of Internet postings about suicide bombings, although it's not certain that Hasan is the author.

A fellow officer told Fox News Hasan fought his deployment to Iraq and argued with soldiers who supported U.S. wars.

Military officials say the 39-year-old Army major was shot four times during today's rampage and is on a ventilator and unconscious.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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UPDATE 9:28 p.m.:FORT HOOD, Texas (AP/WVLT) -- The Fort Hood shooting suspect is alive and was not killed by authorities responding to the attack, contrary to what Lt. Gen. Bob Cone initially said in a news conference Thursday afternoon.

Lt. Gen. Cone also says the death toll from the attack remains 12 after another victim died.

Authorities said immediately after Thursday's attack that they had killed the suspected shooter., Maj. Malik Nadal Hasan., but Cone now says the suspected shooter is alive and in stable condition.

Cone offered little explanation to reporters at a news conference as to why the suspect was believed dead, saying only there was confusion at the hospital.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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UPDATE 6:05 p.m.: WASHINGTON (AP) -- A law enforcement official says a shooting suspect at Fort Hood has been identified as Army Maj. Malik Nadal Hasan.

The official said Hasan, believed to be in his late 30s, was killed after opening fire at the base. The official spoke on condition of anonymity because he was not authorized to discuss the case publicly.

The official says investigators are trying to determine if Hasan was his birth name, or if he changed his name and converted to the Islamic faith at some point in his life.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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UPDATE 5:37 p.m.: WASHINGTON (AP) -- AP source: Fort Hood shooting suspect is Maj. Malik Nadal Hasan.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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UPDATE 5:15 p.m.: WASHINGTON (AP) -- President Barack Obama is calling a mass shooting at a Texas Army base a "horrific outburst of violence."

He says he doesn't yet know all the details but promised the government would get "answers to every single question."

The commander in chief says it's a tragedy to lose a soldier overseas and even more horrifying when they come under fire at an Army base on American soil.

Obama also said his thoughts and prayers are with the wounded and families of the fallen.

The U.S. Army says 12 people have been killed and 31 wounded in a shooting rampage on the Fort Hood Army base in Texas.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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UPDATE 5:06 p.m.: FORT HOOD, Texas (AP) -- The U.S. Army says 12 people have been killed and 31 wounded in a shooting rampage on the Fort Hood Army base in Texas.

Lt. Gen Bob Cone said at a news conference that one shooter has been killed and two suspects were apprehended on Thursday. He says they are all U.S. soldiers.

The shooting began around 1:30 p.m. Cone says that all the casualties took place at the base's Soldier Readiness Center where soldiers who are about to be deployed or who are returning undergo medical screening.

He says the primary shooter used two handguns in the attack.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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UPDATE 4:58 p.m.: UNDATED (WVLT) -- Twelve people are dead and 31 are wounded after a shooting at Fort Hood, Texas, U.S. Army Lt. Gen. Bob Cone confirmed in a news conference.

Lt. Gen. Cone says one shooter is dead, and two suspects are in custody. He says all three were U.S. Soldiers.

One of the 12 dead is a police officer, Lt. Gen. Cone says. It's not clear whether the dead shooter is among the 12 killed.

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UPDATE 4:33 p.m.: FORT HOOD, Texas (AP) -- A Fort Hood spokeswoman says one shooter is in custody after a mass shooting on the Texas Army base. Army officials say at least seven people are dead and 20 wounded.

Fort Hood spokeswoman Sgt. Rebekah Lampan says authorities believe at least two gunmen were involved in the attack on Thursday.

She says it is not known whether the shooters were soldiers or civilians.

Lt. Col. Nathan Banks, an Army spokesman in Washington, says there was a pair of shootings at the base.

Banks says the first shooting was at 1:30 p.m. and at personnel and medical processing office. He says the second incident took place at a theater on the base.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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UPDATE 3:59 p.m.: WASHINGTON (AP) -- President Barack Obama has been briefed about reports of a shooting at Fort Hood, Texas.

White House press secretary Robert Gibbs said the president is being kept updated as details about the shooting emerge.

Gibbs said he told Obama about TV news reports that seven people were dead at the Texas military location and others were injured. Gibbs said he informed Obama based on broadcast reports and the president is being kept up to date through the White House Situation Room.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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UPDATE 3:56 p.m.: WASHINGTON (AP) -- The Army says seven people were killed and 20 wounded in a pair of shootings at the Fort Hood Army base in Texas.

An Army spokesman at the Pentagon says the shootings began about 1:30 p.m. Thursday at a personnel and medical processing center at Fort Hood.

The spokesman, Lieutenant Colonel Nathan Banks, says two shooters were apparently involved. There is no word yet on who they were, nor on identities of the dead.

Banks says the second incident took place at a theater on the sprawling base.

He says it is too soon to tell whether there is any link to battle stress or repeated deployments. The Army is suffering a record high suicide rate and other signs of stress from fighting two wars.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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UPDATE 3:49 p.m.: FORT HOOD, Texas (AP) -- The U.S. Army has closed its massive Army base at Fort Hood, Texas, amid reports that several people have been shot and killed at the post.

The Web site of the base in central Texas has posted an alert that says, "Effective immediately Fort Hood is closed." The Web site said that units at the base have been ordered to account for all personnel.

The site says, "This is not a Drill. It is an Emergency Situation."

Several television stations in Texas say several people were both killed and wounded in the shooting. Officials at the base and in the nearby town of Killeen, Texas, have not confirmed those accounts.

Fort Hood is located halfway between Austin and Waco.

(Copyright 2009 by The Associated Press. All Rights Reserved.)

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FORT HOOD, Texas (KWTX/WVLT) -- At least seven people have been killed and 20 wounded in a shooting at Ft. Hood in Texas, Army officials tell The Associated Press.

The Associated Press reports fifteen have been shot and among those seven are dead.

Temple ISD reports they are on a "soft" lock down in connection with the Fort Hood.

"Temple Police Department requested Temple ISD place all campuses and district buildings in a soft lockdown, due to a situation at Fort Hood, TISD spokesperson Regina Corley told News 10 by news release.

"We have been directed to follow our regular dismissal schedule," Corley said in a follow-up release.

Details have not been released but it is known that ambulances and police are converging on a location in the center of the sprawling military post.

Ambulances from several agencies have been dispatched.

One unconfirmed report indicates an armed gunman has fired several shots and may have hit several people.

Ft. Hood officials report the area is not secure.

If you know a soldier stationed in Ft. Hood, please call the WVLT newsroom at 865-766-8154 or email michael.grider [at] wvlt-tv.com or brian.gregory [at] wvlt-tv.com.

(This information was provided by WVLT sister station KWTX in Waco, Texas. The Associated Press contributed to this report.)