I don't like your sentence, Maybo, because I don't see a good link between the two clauses. That means that the linking word and doesn't seem appropriate to logically connect the two things that you want to say.
In terms of preposition use, this is how I'd teach you:
in connection with
This is a good phrase to use to talk about police investigations, just as you're trying to do. Here's a good example:
Three other people have been arrested in connection with the case.