What is tte iu no?

So I ran across this sentence: 全部あいつがやったって言うの？

I understood "All these guys were killed..." but I don't know what the って言うの is supposed to say or do in the sentence.

[全部　あいつが　やった]　って　言うの？

I don't know the context, so I cannot be sure about the "kill" thing - it is true that the verb "yaru/yarimasu" can mean "to kill," but also it can mean simply "to do."

So I take the part in the brackets (above) to mean "He did all of that," "he did it all," whatever it is he did :)

The whole sentence means:
- Are you saying that he did all of that?

BTW, if it's with another intonation,
also it can means...
Should I say "he did all of that"?

However it's very rare case.(^_^;)

Well the scene has her checking a bunch of dead bodies. Then after she's done checking them, she says the sentence I posted.

Ok, still then my earlier interpretation stands.

- Are you saying that he did all this?
- Are you saying that he did all this (killing)?
- Are you trying to tell me he did all this?