The recent mass shooting incidents at Connecticut elementary school, a Colorado movie theater, and a Sikh temple in Wisconsin, among other places, have made a once-unlikely question relevant:

What should you do if someone comes into your workplace, school, or public venue and starts randomly shooting at people?

The three-part answer, according to the Department of Homeland Security, is Run, Hide, Fight. If you can get out of the building or the vicinity of the shooter, do so. If you can't, hide. If you can't run or hide, as a last resort, resolve to incapacitate the shooter through any means necessary.

The video above, produced last summer by the City of Houston (Tx.) Mayor's Office, was shared by the Limerick Township Police Department on its Facebook page on Thursday. 

The video dramatizes a situation in which an armed man enters a large office building and indiscriminately opens fire on the occupants. 

The Limerick Police Department said it trains with other police departments in the area to respond to active shooter incidents.