Runner Interference on Infield Fly

 
With no outs and the bases loaded, the batter hits a high pop up, in fair territory about 10 feet from first base. The first baseman easily settles under the pop-up, so the umpires correctly call an infield fly.
 
As the runner on first base hustles back to first base, he accidently runs into the first baseman (who is directly in the base path and directly in the runner's base path) just as the first baseman is about to catch the infield fly. The first baseman drops the infield fly and the ball bounces toward the outfield. The runner from first base stays at first base. The runner on second base advances safely to third base. The runner on third base safely scores.
 
Who is out, who is safe, and who scores? Where are the batter and runners placed?
 
Call
In the situation below, the batter is out on the infield fly. The runner at first base is also out because he interfered with the first baseman fielding the batted ball. It does not matter the intentions of that runner or the position of the fielder relative to the base path. The other runners should not benefit from their teammate's interference, so the the other two runners must return to the bases that they occupied at the time of the pitch.