Army investigators continue to look for answers into the cause of Thursday's shooting rampage at Fort Hood, Texas. 
They have a suspect in custody; an Army psychiatrist who is alive and in stable condition after being shot by a civilian police officer.

CBS' Manuel Gallegus joins us live from Fort Hood this morning with the latest:

It's a day of mourning today in Fort Hood, TX... the scene of the worst killing spree ever at a U.S. military base.

"There was a single shooter who was shot multiple times at the scene. However, He was not killed as previously reported," said the Army's Lt. Gen. Bob Cone

Authorities say the shooter was 39 year old Major Nidal Malik Hasan - a military psychiatrist who was reportedly about to be shipped overseas.

He allegedly walked into a processing center Thursday afternoon and opened fire on his fellow comrades. At least 13 people died . 31 others were wounded including Steve Bono's daughter Army Specialist Keara Bono, of Independence, Missouri.

"It's a scary deal. So I've just been just nerves on end, you know? Trying to figure out what's going on here," said her father, Steve Bono.
(Keara was shot in the back of the shoulder, but is expected to recover.  She was able to call her family after the shooting)

Federal officials are also trying make sense of this tragedy. The big question for investigators is why a fellow soldier would want to hurt one of his own.

"You don't expect your own battle buddies to turn around and do something like that to you after you go to war together," said Specialist Michael Stroup.

Hasan was transferred to Fort Hood after a "poor performance  evaluation" at Walter Reed Medical Center.

He recently caught the attention of officials because of possible Internet posts about suicide bombings and other threats. He apparently also got into arguments with other soldiers who supported the wars in Iraq and Afghanistan.

"It's difficult enough when we lost these brave Americans in battles overseas.  It is horrifying that they should come under fire at an Army base on American soil," President Obama said.

Military officials say they want things at Ford Hood to return to normal as soon as possible. But the tight-knit community will no doubt be shaken for a very long time.

(Manuel Gallegus - CBS News)