Flies within my underground store? For 4 days so far, I've had flies inside my basement fundamental...

For 4 days so far, I've had flies inside my basement fundamental and on the door. My door is a walkout door and i dont know why they are there. There is definately no dead animals within my basement and there is no foul smell, and we a short time ago dont know why they are there!please help.
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flies come from magets and magets come from dead things, sorry, conceivably a mouse or trash that gets moist

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If there's something sweet or sticky around they might be after that... or vinegar...? They are attracted to things other than rotting meat, just verbs the area thoroughly (check to make sure it's not the actual cleaning stuff that attracts them first :p).
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They probably a moment ago came in when you open the door. Having flies in your house is rather mundane. It doesn't mean anything.
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Answers:    Think roughly speaking it..The basement is cool and the flies are probably just floppy out there because it's cool. In the fall you will find them on the door looking for temperature when it is cooler out.