Foul, then horn, but no free throws?

[NCHSAA]

A1 gets fouled and the official has a whistle. However, the clock operator cannot stop the clock in time and the horn sounds to end the game, but clearly after the foul. About 1 - 2 seconds should have been put back. One official has A1 come to the line, while the calling official rules that the free throws will not be shot and the game is over. The score was Team A = 52 Team B = 67.

Thoughts??