The UK's National Counter Terrorism Security Office (NACTSO), in the wake of last week's Parish attacks which claimed 129 lives, has published the advice on what to do in a gun and bomb attack similar to the one witnessed in the French capital last week which claimed 129 lives.
Counter-terror officials released tips on how to behave in an attack, asking people to "escape if you can", rather than lying down, or to barricade themselves into a safe place with their phones on silent.
The document outlines what to do in "response to a fast moving incident such as a firearms or weapons attack" and also advises businesses to develop procedures for what NACTSO called a "dynamic lockdown" to stop armed terrorists entering a site.
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In the event that escape routes are cut off, then officials advise finding cover from the gunfire behind "substantial brickwork or heavy reinforced walls" as "cover from view does not mean you are safe, bullets go through glass, brick, wood and metal".
The document, which reiterated Britain's "Severe" terror threat level, meaning an attack is highly likely, also stresses that police have exercised plans to respond to multi- seated firearms attacks and may increase their presence in some areas.