This video has been released today as counter terror police step up their advice to the public.
The clip reiterates the counter terror police chiefs' guidance for what members of the public should do if they get caught in a terror attack in Britain.
People should escape if they can, considering the safest route - but only if they can do so without endangering themselves.
If they can't run, it's safest to hide.
They should find cover from gunfire, remembering that if they can see the attacker, the attacker can see them.
The video tells you to think about what you would do if you were in your workplace or in a public place.
It notes that being out of sight doesn't mean a person is safe - as bullets can go through wood, glass, metal and brick.
We are also warned to turn our phones to silent.
Finally, when safe to do so, we should inform the police by calling 999
The video was published by the National Police Chiefs Council today ,
as part of instructions to police forces and business owners on 'dynamic lockdown' procedures.
The 'Run, Hide, Tell' principle was first issued last year, but has been reissued as part of the police's new dynamic lockdown procedures.
Leave belongings behind.
Cover from view does not mean you are safe, bullets go through glass, brick, wood and metal.
Move away from the door.
Call 999 - What do the police need to know?
Further information – Casualties, type of injury, building information, entrances, exits, hostages etc.
Stop other people entering the building if it is safe to do so.
Armed Police Response
Keep your hands in view.
Officers will evacuate you when it is safe to do so.
You must STAY SAFE
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