UPDATE: An Air Force base in Ohio says there was "no real world active shooter incident" hours after authorities responded to reports of a shooter.
Wright-Patterson Air Force Base says via Twitter that base personnel remain safe.
The base said the report occurred during a "normal, scheduled installation exercise" that included an active shooter scenario.
Security forces and other emergency responders had rushed Thursday to the hospital at Wright-Patterson near Dayton.
Wright-Patterson had sent a tweet saying it was responding to a "reported Active Shooter incident."
About two hours later, video from outside of the hospital showed service members and others standing outside the building. Some had come out with their hands in the air.
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ORIGINAL STORY: DAYTON, Ohio (AP) - Federal authorities say they're responding to reports of an active shooter at an Air Force base in Ohio, and the base is on lockdown.
Security forces and other emergency responders are outside the hospital at Wright-Patterson Air Force Base near Dayton.
The Bureau of Alcohol, Tobacco, Firearms and Explosives said via Twitter it's among several agencies responding to reports of an active shooter.
Wright-Patterson sent a tweet saying it was responding to "a reported incident."
Stacey Geiger in the base's public affairs office said the base was on lockdown but she had no other information to release.
Local police were directing traffic away from the base.