The company I work for has held shelter in place drills for years now. There are several companies near that use a lot of dangerous compounds. The idea is to stay in the offices, close all doors and turn off air handling equipment. I am guessing BPD did not require that last one.
It’s been around a while. I was going to say that I’ve heard shelter in place warnings on the news occasionally, and looking at Wikipedia’s list, it makes sense since there have been several in the San Francisco Bay Area. The earliest listed is from 1997, for the North Hollywood shootout.
In my office (federal agency in DC), it’s been an option in our emergency response training for some years now. It wasn’t necessarily designed for instances of escaped criminals, but rather for disasters like a dirty bomb, where evacuating people into the streets would just make the situation worse.
For decades. I work in an area that is something of a minor league industrial hell - fertilizer plant, sulfuric acid plant, refineries. “Shelter in place” is a pretty common parlance out here for what to do ( and where ) when there are certain types of atmospheric chemical releases or other disasters.
Yes, there are some oil refineries around the S. F. Bay Area. Every time they have an incident that involves release of nasty fumes (like if there’s a fire or a leak), there is some kind of emergency broadcast. “Shelter In Place” is one of the categories of response that they might ask people to do, depending on the extent of the toxic release, how dangerous it is, wind conditions and direction, and so forth.
It means stay indoors and keep windows closed, and I think shut of air conditioning if it draws in air from outside. It is used for less serious cases, as opposed to serious cases that might result in an evacuation order.
ETA: And as most others have already noted: No, it’s nothing new.