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Prepare yourselves – this afternoon, 87 million phones will vibrate, play a loud noise, and potentially freak you out as the government sets off a national alert.

It is the second nationwide test of a warning system, telling people there is a danger to life.

The government said it plans to use system to issue real warnings, such as in severe weather or if there is an incident that has a severe danger to life.

Pat McFadden, work and pensions secretary, previously said: ‘On Sunday September 7, we will hold a UK-wide test of the Emergency Alerts system to ensure it works when we need it most.

‘It is a vital tool for keeping the nation safe when lives are on the line – a

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