All clear given after US Andrews Air Force Base put on lockdown

The medical center on Andrews Air base is still on lockdown, after an active shooter incident put the complex on alert on Thursday afternoon. An all clear was given for the rest of the base.CBS reported that an Air Force spokesperson at the Department of Defense confirmed the lockdown, and personnel in the affected area were advised to shelter where they were. It is still unknown as to the nature or context of the incident, and whether there are any casualties.The huge military site in Maryland is the home of Air Force One.A tweet from the Air Force base account first broke the news:

JBA is currently on lockdown due to a report of an active shooter. All personnel are directed to shelter in place. More info as it comes.

— Joint Base Andrews (@JBA_NAFW) June 30, 2016