[David Van Milligen]

"As long as F2 is "attempting" a throw, it is (or can be) interference on the batter. See, for example, 7.3.5A, C, D"

I agree with both Bob and Jim, but in the many games I seen, I coached for 10 years and still watch as many or more games then I ump, I have never seen an interference called without the catcher actually releasing the ball.