UPDATE: 12:35PM - According to the Associated Press, reports of an active shooter at a military post outside Washington stemmed from someone who made a distress call after seeing security forces doing a routine inspection.

The confusion was heightened by a planned active shooter drill at Joint Base Andrews that had not yet begun and was planned for later in the morning. The base said in a Facebook post Thursday that there was no shooter and no threat to the base or workers there, the AP said.

The base had been placed on lockdown after an active shooter was reported. The base is home to Air Force One and is about 20 miles from Washington.

UPDATE: 10:55AM-  The Associated Press is reporting that the lockdown has been lifted at Joint Base Andrews, except for the medical building where an active shooter was reported.

Joint Base Andrews said in a tweet Thursday morning that the all-clear was given for the base except for the medical building. The base did not say why the building remained on lockdown, the AP said.

A law enforcement official says no active shooter was found at a military post outside Washington.

The law enforcement official was not authorized to discuss the matter by name and spoke on condition of anonymity, according to the Associated Press.

The base had been placed on lockdown after an active shooter was reported. The base is home to Air Force One and is about 20 miles from Washington, the AP said.

Original story continues below

According to a report from the Associated Press, first responders are trying to secure the scene of an active shooter report at Joint Base Andrews near Washington DC.