Bluebottles (the insects) what cause them? I have have 4 of them in my house today and they...

I have have 4 of them in my house today and they are horrible, what cause them, my windows hold been shut adjectives day, is here something in my house that cause them to come in or are they purely like flys and are flying around?
Answers:    The website below will explain a great deal about the flies. Something contained by or around your house is attracting them. Find that, clean it up, and they will progress away. Good luck.
they were here back humans and they'll be here after we're all limp and gone.