*This post has been updated since publication.
Here's the latest:
At 9:45 p.m. Central time, Lt. Gen. Mark Milley of Fort Hood offered a press conference. Here are the details he provided.
The shooting began at 4 p.m. from a single soldier in a medical brigade area. First responders reacted within 15 minutes. The responders engaged with the soldier who ultimately turned his gun on himself and killed himself. The soldier killed three and wounded 16 before killing himself. All victims were in the military. They do not believe the incident had any connection to terrorism but are still investigating. The weapon was a .45-caliber Smith and Wesson handgun. The weapon was not registered on base. Milley declined to reveal the soldier's name, as next of kin have not been informed yet. He said the soldier was in treatment for depression and anxiety. He was undergoing a process to determine whether he had post-traumatic stress disorder but was not yet diagnosed.
Previously in the evening:
KCENTV, a local news station near Fort Hood, Texas, is reporting 8 injuries, 4 of which are criticial, and the shooter is reportedly dead. A live statement from Fort Hood officials is being prepared.
There are multiple unconfirmed reports that the shooter has killed himself and was wearing a uniform.
CBS has identified the shooting suspect as Ivan Lopez, 34, and said sources told the shooting is a result of a "soldier dispute." Officials are now saying four are dead, and that includes the shooter.
President Barack Obama spoke briefly about the incident:
"We're following it closely," Obama told members of the White House press corps, according to a pool report. "The situation is fluid right now … I want to just assure all of us we are going to get to the bottom of exactly what happened."
He continued, "We're heartbroken something like this might have happened again."
A press conference at Fort Hood has been planned but keeps getting pushed back.
At 9 p.m. central time, the lockdown at Fort Hood was lifted.
There is an active shooter incident at the Fort Hood Army base in Texas.
Watch the live feed from KCENTV.com here.
Follow Fort Hood's Twitter feed here.
The tweet asking people to shelter in place below:
NBC is reporting that "As many as eight people may be injured, and there may have been two shooters":
Multiple people have been injured and the search for the gunman is underway after a shooting at the Fort Hood Army post Wednesday afternoon.
Reports of an active shooter triggered a lockdown at Fort Hood, with local sheriff's deputies and the FBI immediately responding.
Just after 5 p.m. local time, the base tweeted that all personnel were being asked to shelter in place, close doors and stay away from windows.
As many as eight people may be injured, and there may have been two shooters, NBC News reported. One of those is believed to be "down," while the second is believed to be at-large.
Fort Hood confirmed that a shooting occurred at the base, though the number of people injured and the severity of their injuries has not been confirmed.
A post spokesman has confirmed that one person is dead.
CNN is reporting that "according to multiple U.S. officials" a shooter is dead.