If you are told to shelter indoorsÂ
- Keep all doors and windows closed
 - Move away from windows
 - Turn off air conditioning
 - Find a safer place inside, such as a corridor or windowless room
 - Tune into your local radio stations - they will be helping the police to issue advice
 - Make sure a telephone is close by
 
If you are told there is an evaucation
- Leave the building you are in as soon as possible
 - Use your building evacuation plan if you have one
 - Wear appropriate clothing
 - Tell other people and help those who need it
 - Use security and other staff to lead people to a safer place
 - Follow the instructions and advice of the police and those helping them
 
How will you know what to do
Information will be provided by:
- police officers on the street
 - people helping the police such as other emergency services or security staff
 - local radio stations
 - public address systems
 - shop and pubwatch radio schemes
 
You can also receive updates directly from the police by following them on Twitter or Facebook.
Last updated: 16 Aug 2018, 10:16 a.m.