2 and 1 or 2 free throws?

[Rob1968]

2-man mechanics, Lead is on the endline, right side of the lane, Trail is towards the center of the floor, on ball, when the following play occurs:

A1 drives from the top of the circle, on the right side of the lane, and as he is in the air, in the act of shooting, a secondary defender fouls him on the arm. The ball goes up, higher than the rim, and as it comes down, it lands in the hands of the shooter, below the height of the rim.
Immediately, a defender hits up at the ball, striking the shooter's hand which is under the ball, which causes the ball to fly upward, and as the players land, the ball falls directly through the basket.

Should the basket count, with one free throw to be awarded?

Or, should the shot be considered as unsuccessful, and two free throws be awarded?