At least seven people are dead and 12 wounded in a shooting at Fort Hood in Texas, the base's public affairs office told NBC News on Thursday.
The official would not give his name nor additional details. It was unknown whether victims are soldiers or civilians. One gunman was reportedly in custody and another was on the loose, NBC News said.
NBC affiliate KCEN in Waco reported that the second suspect may be holed up in a building on the post.
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The base was reportedly on lockdown. Two nearby school districts were also being locked down.
Fort Hood is adjacent to Killeen, and 60 miles northeast of Austin. The sprawling complex is home to at least 4,929 active duty officers and 45,414 enlisted. Civilian employees total nearly 9,000.