MSNBC reports that seven people have been killed and 12 injured in a shooting at Fort Hood, Texas.

Update at 3:17 p.m. ET: MSNBC says the shooters were in military uniforms.

Update at 3:20 p.m. ET: MSNBC adds that one gunman is in custody and one is on the loose.

Update at 3:23 p.m. ET: KWTX says Fort Hood officials confirm that a "violent incident" has occured, but offered few immediate details.

Update at 3:26 p.m. ET: FOX News reports the attack apparently happened at the Soldier Readiness Center.

It's not yet clear whether the victims are soldiers or civilans.

Update at 3:40 p.m. ET: NBC News affiliate KCEN in Waco reports that a third shooter may be involved and that the second suspect may be holed up in a building on the post.

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