Bridlington Coastguard Rescue Team and the Coastguard Rescue Helicopter were deployed after the red flare was seen at around 8pm.
A thorough search of the area was carried out before it was established that the flare had been set off as part of the "clap for the NHS" celebrations.
A spokesperson for the coastguard said: "Whilst we wholeheartedly support our colleagues in the NHS, members of the public are advised that the misuse of distress flares is a serious criminal offence."
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