A siren will go off on nearly every smartphone in the UK on Sunday 23 April, the government has announced. From a report: The 10 seconds of sound and vibration at 15:00 BST will test a new emergency alerts system. The test had originally been planned for the early evening but was moved to avoid clashing with an FA Cup semi-final, which kicks off at 16:30. The government was also keen to avoid a clash with the London Marathon, which starts at 09:30 on that Sunday. The alert system will be used to warn of extreme weather events, such as flash floods or wildfires. It could also be used during terror incidents or civil defence emergencies if the UK was under attack. The minister in charge of the system, Oliver Dowden, said it would be used only in situations where there was an immediate risk to life. In most cases it will be targeted at very specific areas, rather than the entire country and, according to officials, may not be used for months or years.
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