Individuals who find themselves in the middle of a Paris-style gun attack should try to escape the scene rather than pretend they are dead, according to new official guidance.
The advice, published by the UK's National Counter Terrorism Security Office, has advised victims caught up in "fast moving incidents such as a firearms or weapons attack" to either run away or hide behind "substantial brickwork or reinforced walls".
The guidance comes in the wake of the series of terror attacks across Paris last Friday that left 129 dead and injured many more.
Many survivors of last week's attacks have said they dived to the floor and played dead in the hope that the terrorists wouldn't pay attention to them.
This was particularly the case at the Bataclan concert hall, where eyewitnesses said they hid among dead bodies to save themselves. Survivors of the terror attack on a Tunisian beach this summer have given similar accounts.
But the new guidance suggests individuals should try to escape where possible and convince others to leave too, if it's safe to leave without exposing yourself to more danger.
But where escape is not possible, the advice says, people should get out of the line of sight of the attacker and then silence their phone.
The document also warned individuals that, after any such attack, they could be treated with hostility and some police may "point guns at you".
The guidance also warns businesses that all staff should be familiar with – and should be tested on – safety procedures.