The casualty total at Fort Hood has climbed to one dead, and at least fourteen injured, with some media outlets reporting a fatality, although that has not been confirmed.
According to conflicting reports, one shooter was dead or in custody, but a second shooter was reportedly on the loose.
The FBI, as well as state and local law enforcement, have been sent to assist in the response to the incident.
In 2009, Nidal Hasan carried out a terrorist attack that has been unacknowledged by the Obama Administration. The attack left 13 people dead and 30 wounded. Hasan was sentenced to death after a month-long court martial last year.
A statement from Fort Hood said:
"Fort Hood's Directorate of Emergency Services has an initial report that a shooter is dead but this is unconfirmed.
"The injured personnel are being transported to Carl R. Darnall Medical Center and other local hospitals. Numerous law enforcement agencies are in support and on the scene. The number of injured are not confirmed at this time. No further details are known at this time.
"The post is currently still on lock down."