Authorities are reporting an active shooter situation at Fort Hood in Texas

According to KCEN, several injuries have been reported and at least one patient is being transported to the hospital with injuries. The shooter was reportedly inside of building 33026, the Medical Brigade Building.

The shooter is said to still be at large, but Fort Hood is telling everyone on the premises to seek shelter in place:

In November 2009, Maj. Nidal Malik Hasan shot and killed 13 people and injured over 30 at Fort Hood. It remains the worst shooting ever to take place on a military base in America. Guily was convicted and sentenced to death in 2013.

As a safety precaution, Fort Hood has been placed on lockdown.

NBC News reports that as many as eight people have been injured and transported to local hospitals. KCEN adds that there's one confirmed fatality. According to NBC News, officials said there are two shooters: one is in custody, while the other is still at large. 

According to NBC News, military officials say the shooter—the lone gunmanis down is dead. Of the injured, at least four are serious.

UPDATE: Military officials say the man who killed three people and injured 16 others before killing himself was an Iraq veteran being evaluated for post-traumatic stress disorder.

According to the New York Times, a Pentagon official identified the shooter as Army Specialist Ivan Lopez, who served four months in Iraq in 2011 and was being evaluated for PTSD, but had not been officially diagnosed with it. The Times adds that Lt. Gen. Mark A. Milley, the commanding general at Ft. Hood, said there were indications that Lopez self-reported a traumatic brain injury after returning from Iraq.

[via KCENNew York Times and NBC News