This is a breaking news story. Check back for updates.

UPDATE 12:23 a.m. EDT: According to reports from WMC-TV citing a "reliable source," Sergeant First Class Amos Patton, a Tennessee National Guard employee, fired seven to 10 shots at his commanding officers before he attempted to run and was "taken down" by fellow guardsmen. One of the gun shots hit Major Jeff Crawford in the thigh, while another bullet hit the sergeant in the foot, and a third guardsman was grazed in the arm. The report, citing the source, said Crawford and the third victim were released from Regional Medical Center after being treated for their injuries. Patton remains in custody.

UPDATE 7:30 p.m. EDT: The two shooting victims have been identified as a major and a sergeant major. A Tennessee National Guard employee remains in police custody after shooting his commanding officers at the National Guard Armory, reports WMC-TV. Maj. General Haston said that the two people shot in the incident were seasoned recruiters. One of the victims served in Iraq in 2005 and Haston believes the other may have served in Afghanistan.

UPDATE 2:53 p.m. EDT: One of the soldiers was shot in the leg while the other was shot in the foot, a law enforcement official told a news conference. As far as reports that the shooter was a disgruntled employee, the official would only say, "we're still investigating."

UPDATE: The lockdown at Millington Naval Base has been lifted, the Navy tweeted.

UPDATE 2:45 p.m. EDT: The shooting followed an argument between three National Guardsmen at the National Guard Armory in Millington, according to NBC News. The armory is part of naval property but not on Millington Naval Base. A military officials told the network that the shooting "is not Navy related."

UPDATE 2:41 p.m. EDT: The Navy has identified the two victims in the Millington shooting as soldiers.

UPDATE 2:35 p.m. EDT: The Navy is confirming that the shooter is in custody:

UPDATE 2:30 p.m. EDT: According to WREG, the shooter was fired shortly before the incident. He then came back with a gun.

UPDATE 2:25 p.m. EDT: Memphis television station WMC-TV is reporting that two people were shot on the Millington Naval Base and that the victims are in non-critical condition. The shooter is in custody.

UPDATE 2:16 p.m. EDT: The U.S. Navy official Twitter account confirmed an incident but did not go into specifics:

At least two people have been shot Thursday at an Army National Guard recruiting center in Tennessee, Memphis television station WREG reported.

A shelter-in-place order was implemented at Millington Naval Base, which is situated near the recruiting station, according to WREG. The station said multiple ambulances were on the scene.

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