Double violation on a FT

[Nevadaref]

From the penalty section of 9-1-3.

“...
3. If there is a simultaneous violation by each team, the ball becomes dead and no point can be scored. Remaining free throws are administered or play is resumed by the team entitled to the alternating-possession throw-in from the designated out-of-bounds spot nearest to where the *simultaneous violation occurred.

4. If there is a violation first by the free-thrower's opponent followed by the free thrower or a teammate:

a. If both offenders are in a marked lane-space, the second violation is ignored, as in penalty item (2).

b. If the second violation is by the free thrower or a teammate behind the free-throw line extended and/or the three-point line, both violations are penalized, as in penalty item (3).”

You had the situation described in 4b, so refer to part 3 for how to penalize and resume the game.