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Detailed explanation-1: -Germany on Friday carried out the first nationwide test of its civil alarm systems since the end of the Cold War, sounding several alarms.

Detailed explanation-2: -Sirens howled during the Second World War The beginning of the Second World War in 1937 ensured the widespread use of sirens as a means of warning. About 11, 000 sirens warned the population of air raids in Germany. Any other use was forbidden. They were only allowed to be used for air raid alerts and all-clear.

Detailed explanation-3: -Around 80, 000 sirens were in use up to the end of the Cold War. Back then, there was still a national siren network. These sirens were largely dismantled at the start of the 1990s for cost reasons. Germany has not had a nationwide siren network ever since.

Detailed explanation-4: -These sirens are used to warn the public of hazardous situations such as chemical accidents, natural disasters and other such community-important incidents. For one minute, the sirens will sound in certain communities and cities across the entire state.

Detailed explanation-5: -The UK-wide early warning system was largely dismantled in the early 1990s. Around 1, 200 sirens remain, but these are mostly used to warn the public of severe flooding. They are also used for public warning near gas or nuclear power plants, nuclear submarine bases, oil refineries and chemical plants.