I'm starting to learn German and I'm confused with usage of those two.
Should I use accusative or dative in the following?

> 
> In dem Kino sitzen Bürger. – dative
> 
> 
> 

or

> 
> In das Kino sitzen Bürger. – accusative
> 
> 
> 

That is, is Kino an indirect object (dative, im Kino) or a direct object (accusative, ins Kino)?