A U.S. military official confirmed to NBC News that a service member is in custody after making a threatening phone call.
The official said the individual placed a call to Fort Hood, threatening to harm people.
The incident is under investigation.
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Fort Hood officials have not released any further information.
The incident happened just one day before the first anniversary of an on-post shooting that left four people dead and more than a dozen injured.
NBC 5 will update this story with more information as soon as it's available. As this story is developing, elements may change.