Did they get it right?

[harmbu]

FED rules. Bases loaded with no outs. Ground ball to F6 who throws to F4 for the force. Contact is made by the runner beyond the bag preventing a throw from being made. The batter is called out on the interference. Where do the runners who were on second and third at the time of the pitch go?

I am sure they got it correct, but I would like a rule book and case book reference to prove that they did.