Who can receive emergency alerts? Emergency alerts are sent out to devices that are within a specific geographic area. Read more Photo: Johnér
How the Emergency Alert System works Emergency alerts are sent out via the mobile telephone network, to all mobile telephones in a defined area. Read more Photo: Colourbox/illustration
What do the advice mean? An emergency alert contains information about what is happening and what you should do to protect yourself. Here are examples of advice that can be given. Read more Photo: Johnér
