A shooting at Fort Hood prompted the base and nearby schools to order a lockdown, according to a report on MSNBC.
The news station said seven people were killed and 12 wounded. The station said there were two suspects in the shootings.
KCEN-TV in Central Texas reported that one person was in custody and one was still at large. It quoted a source as saying that shooter has a high-powered rifle and is aiming to kill.
Killeen ISD says all Fort Hood schools are on lockdown.
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. A third shooter may be involved, according to NBC News affiliate KCEN, which said the person had opened fire on the SWAT team at the base.
KCEN reported that a policeman was among those shot.