Unlike fuel gauges, land surveys, and radar, fast-breaking news of explosions carries a significant risk of mistransmission or inaccuracy. They might know when/where the explosion occurred, but not necessarily have much confidence on how fast debris might have been ejected and in which directions.

https://www.youtube.com/watch?v=w6hIXB62bUE ATC was being extremely cautious and diverting planes over quite a large area for quite some time to avoid the risk of debris hitting airplanes.