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Fort Hood, Texas, observed a day of mourning Friday to honor the victims of a shooting at the Army base's Soldier Readiness Center, base officials said.

A 13th massacre victim died in a hospital after being shot and wounded by alleged gunman Maj. Nidal Malik Hasan, 39, who pulled out two handguns and began firing on soldiers as they prepared to deploy, Col. John Rossi, deputy commanding general at Fort Hood, said Friday during a news conference.

Of the 30 people injured, 28 remain hospitalized, Rossi said. One civilian was among the 13 who died and several civilians were among the injured, he said.

Hasan was shot four times by a civilian police officer and remained hospitalized on a ventilator, the colonel said.

The female civilian police officer who shot and wounded Hasan was hospitalized in stable condition, Col. Steven Braverman, base hospital commander, said.

Rossi said FBI and military law enforcement personnel were investigating the incident, including a possible motive.

Rossi said he unaware of an initial confrontation between Hasan and other people.

"We really don't want to get into speculating what he was doing," Rossi said.

In the nearby town of Killeen, a SWAT team and FBI agents searched Hasan's apartment for clues to what led to the shooting, CNN said

Rossi said base officials were focused on care for the wounded and behavioral needs of others, security of the military installation, and notification of relatives and providing on-base grief counseling.

Braverman said more behavioral health providers were being brought to Fort Hood "to reach out to anyone" needing their assistance.

About half of the people hospitalized required surgery and were in stable condition, Braverman said.

While Fort Hood was no longer under a lockdown, it was on heightened alert, Rossi said, adding, "We are fully confident in the security of this
installation."

Rossi said family notifications of deaths were under way.

The deputy commander also praised the effort of first responders and other agencies that helped, saying it "highlights the heroic efforts of soldiers and civilians" at the scene, an administrative area of the processing center.

The military said Hasan was an Army psychiatrist specializing in treating soldiers' post-traumatic stress and stationed at a hospital on the sprawling base in Central Texas.

Initial reports the gunman died at the scene were caused by confusion of the moment, Rossi said.

"In heat of incident, there was a lot of confusion," Rossi said. "It was just a mistake" that was corrected as soon as officials learned of the information and verified the information.

Three others who had initially been held have been released, and authorities concluded Hasan was the only shooter.

Hasan was transferred from Walter Reed Army Medical Center in Washington to Darnall Army Medical Center on Fort Hood in July.

He apparently was upset he was about to be deployed to Iraq or Afghanistan, relatives said.

"He was mortified by the idea of having to deploy," a cousin, Nader Hasan, told The New York Times. "He had people telling him on a daily basis the horrors they saw over there."

President Obama expressed shock about the attack and sympathy for the victims.

"It is horrifying that (soldiers) should come under fire on an Army base on American soil," he said.

The 340-square-mile Fort Hood, one of the largest U.S. military installations in the world, is home to about 65,000 soldiers and family members, with thousands of soldiers deployed at any given time. The base serves as a processing facility for troops about to be deployed and for those returning from combat. Fort Hood, named for Confederate Army Gen. John Bell Hood, is a town onto itself, with nine schools, lots of civilian housing, malls, a theater and ball fields.