Macbeth Act-3 scene -1

In act 3 scene 1  Banquo suspects that Macbeth has attained the crown from foul play. Banquo suspected Macbeth but eventually everyone started to believe that the 2 guards were responsible for carrying out the deed of killing Duncan .Now after the death of Duncan Macbeth has been chosen as the new king .Now Macbeth is planning to conspire to kill Banquo and Fleance the sons of Banquo.