The Purge alarm is an audible alarm sound from the successful film franchise "The Purge". It is a siren that is used to signal a curfew in some cities, such as Crowley, Louisiana, where the police used it to enforce a 9:00 p.m. to 6:00 a.m. curfew during the COVID-19 pandemic. The Purge is a horror film that depicts a time in America when a national holiday is celebrated (The Purge) in which all crimes, including murder, are legal for a 12-hour period. When the 12-hour period begins, sirens begin to blare and all emergency services are unavailable. The use of the Purge alarm by the police caused panic among the residents, who found the noise eerily familiar. The police later apologized for using the siren and stated that they would not use any type of siren for this purpose again. The Purge alarm sound effect can be found on YouTube.