The Joint Base San Antonio Lackland in Texas issued an active shooter warning and ordered all personnel to implement lockdown procedures, the base said in a message on Twitter on Wednesday.
Base officials did not immediately respond to inquiries about the incident.
In 2016, two airmen were killed in what military officials said was a “workplace violence incident” on the base.
The joint base was formed through a consolidation of two Air Force Bases and the Army’s Fort Sam Houston in 2010, provides basic and advanced training to military personnel.
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