Representatives at a hospital treating victims of the Fort Hood shooting have said they are confident there will be no further fatalities.
Three remain in critical condition at Scott and White Memorial Hospital, while a further six are being treated there for less serious injuries.
Three patients remain in critical condition at one hospital following the shooting at Fort Hood military base, representatives have said in a press conference.
Scott and White Memorial Hospital said it was treating three patients separately for neck, spine and abdominal injuries.
There are a total of 16 injuries following the shootings overall, while three others and the gunman were killed during the incident.
Of a total of nine being treated in the hospital were eight men and one woman, all of whom were military servants, staff added.
There are no indications that a gunman who killed three people at US army base Fort Hood was involved with "extremist organisations", US Army Secretary John MCHugh has said.
According to Reuters, Mr McHugh said that the gunman was seen by a psychiatrist last month, but showed no signs of violence or suicidal tendencies.
A gunman who killed three people at the Fort Hood US army base apparently did not see combat during a tour in Iraq three years ago, but was undergoing treatment for depression and anxiety, NBC News reported.
Military officials say that records do not show any combat citations or ribbons, but stressed that it did not mean he was not suffering serious psychological problems.
US Defense Secretary Chuck Hagel has said the shooting at Fort Hood showed that there were problems that still needed to be addressed.
"Something is not working", Hagel said, "when we have these kinds of tragedies on our bases." "So we'll identify it, we'll get the facts, and we'll fix it," Hagel told reporters, standing on the flight deck of the USS Anchorage, an amphibious ship, in Hawaii.
Soldiers at home need to feel safe after doing tours in Iraq and Afghanistan, President Obama said, after a gunman with reported mental health issues opened fire at Fort Hood's Army base killing three people.
"We know these families. We know their incredible service to our country and the sacrifices that they make. Obviously our thoughts and prayers ... are with the entire community," Mr Obama said.
"When they're at their home base, they need to feel safe. We don't yet know what happened tonight, but obviously that sense of safety has been broken once again," he said.
A US soldier shot dead three people and injured at least 16 before taking his own life at an Army base in Fort Hood, Texas, the site of another deadly rampage in 2009, US officials said.
The soldier, who was being treated for mental health problems, drove to two buildings on the base and opened fire before he was stopped by military police, in an incident that lasted between 15 and 20 minutes, Fort Hood commanding officer Mark Milley said.
Officials at Fort Hood have released few details about the gunman who killed three people before taking his own life in a shooting at the sprawling Army base. Here is what is known about him.
- He was assigned to the 13th Sustainment Command (Expeditionary) at Fort Hood, which is a logistics and support unit. Officials have not released his rank , but said he was not in the process of leaving the Army.
- He served for four months abroad. He was not wounded in action while serving overseas, but self-reported a traumatic brain injury upon his return to the US. "He was not a wounded warrior," said Lieutenant General Mark Milley, the senior officer at Fort Hood.
- He had one weapon, a .45 calibre Smith and Wesson handgun, that was not registered with post authorities as required. Authorities do not yet know how much ammunition he was carrying.
Fort Hood lock down over. No indication of terrorism, say officials. Gunman - an Iraq war vet with suspected PTSD - committed suicide.
Shooter served in Iraq in 2011. His psychiatric history now being probed. 3 victims, killed with semi-automatic pistol.
The gunman at Fort Hood died from self-inflicted wounds, according to the commanding officer at the base.
The commander said the gunman had behaviour ad mental health issues but no motive is known at the moment.
It was also confirmed the man had served in Iraq in 2011.