The Air Force is trying to find out how a mysterious 911 call caused a chaotic 'active shooter' lockdown at an Ohio base

• The Air Force is investigating the details behind a mysterious 911 call about an "active shooter" situation that locked down an Ohio base Thursday
• The base revealed that while there was "active shooter" training going on in another part of the base, there was no "real world" situation
• The only shot fired appears to have been fired by a security forces member attempting to breach a locked door during room-by-room sweeps

DAYTON, Ohio (AP) - Air Force authorities are trying to find out what prompted a 911 call that caused a chaotic "active shooter" reaction on a sprawling Ohio base Thursday.

Spokeswoman Marie Vanover at Wright-Patterson Air Force Base near Dayton said Friday the investigation "is ongoing," and that there's no timetable yet for its completion. She said no injuries have been reported from the Thursday incident.

During an extensive search after the call to base security, a security team member shot a locked door during a room-by-room sweep of the base hospital as people on the base with some 27,000 military and civilian personnel were locked down.

Authorities said the call came during training that included an active shooter scenario in another base area at least a half-mile away, but a link wasn't clear.

The caller reportedly indicated they were located inside the Wright-Patterson Air Force Base Medical center. A call was placed to Greene County 911 about 19 minutes after base officials received a call at their defense operations center, according to local outlets. While the Air Force base will not release the transcript of the call, information on the call made to Greene County dispatchers is available.

"Help, help ... Wright-Patterson Air Force Base ... active shooter Building 830," a suspected female caller told dispatchers. The caller said that they did not know who was involved.

"How many shots have you heard?" the dispatcher asked. "A lot…I've heard I don't know…4 or 5." The caller told Greene County 911 that she was hiding in her office.

The call resulted in "probably upwards of 100" local officers, including specially trained units like SWAT, descending on the base, Dayton Daily News reported, citing a responding officer.

The base was locked down for nearly two hours Thursday, as authorities responded to reports of an active shooter in the base hospital. The Air Force base later revealed in a statement published on Twitter that there was no "real world" active shooter situation.

The only shot fired during the incident occurred when a member of the security forces discharged their weapon into a locked door. Wright-Patterson Air Force Base, noting that the matter is under investigation, would not provide Business Insider with comment on the specific details surrounding the shot fired by the member of the security team.