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I hope someone can solve this mystery for me.
Sorry, I took no picture.

Short story: I squashed a big, green-colored fly, and it turned out that inside it was literally packed with dozens and dozens of tiny and very alive white worms.

What can they be?
- Internal parasites infesting the fly? (how could it be alive? they were literally covering most of its volume)
- Offspring of the fly, as if its eggs hatched inside? Is it possible?


Details:

- I live in central Italy. Happened a week ago, in a very hot August night.

- The fly looked like a large common house fly, maybe 2.5cm in length, but it was green with red eyes. From the gallery, I see it could be maybe a female of Protocalliphora azurea http://www.dipter...to_id=1616
or something similar.

- The fly was totally alive before being smashed (sorry about killing it, I just couldn't sleep). I've seen it around in the house two days before that night.

- The worms looked just like very tiny maggots, all white with a dark tiny head. They were maybe 2 mm in length each. I've seen maybe 20 alive of them. They didn't do much except slowly moving over each other. They seemingly occupied most of the now broken exoskeleton of the fly, not only the abdomen but the torso too.

I've searched the web and the forum here but it can't find anything relevant so I'm just terribly curious.

Thanks in advance!