A mass shooting at Fort Hood on Thursday has thus far resulted in the deaths of twelve individuals and as many as 31 wounded. Officials confirmed that three shooters were involved. One has been killed and the other two have been apprehended.

A spokesman for the Army at the Pentagon said the shootings began around 1:30pm. The first of the two shootings took place at a personnel and medical processing center called a Soldier Rating and Processing Center, which handles administrative details for soldiers. The second shooting incident took place at a theater on the base, the Howze Theatre.

All three shooters were said to be US military soldiers. The suspects were in military uniform. The shooter-at-large had a high-powered sniper rifle. Officials have not yet confirmed whether those killed and injured were civilians or military personnel.

Following the attack, the base has been locked down. The Fort Hood website has posted an alert reading "Effective immediately Fort Hood is closed". The site also says, "This is not a Drill. It is an Emergency Situation." and indicates that units at the base have been ordered to account for all personnel. The FBI is also sending agents to the scene.

Occupying 339 square miles in central Texas, Fort Hood is home to more than 65,000 soldiers, civilian personnel and family members, and ranks as the world's largest military installation. Base personnel have accounted for more suicides than any other Army post since the U.S. invasion of Iraq in 2003, with 75 through July of this year. Nine of those occurred in 2009, counting two in overseas war zones.

There are nine schools on the base. Elementary schools were released before the incident, and the remaining schools are on lockdown, but all are confirmed safe. Lockdown simply means that no one is allowed in or out of the schools.