When a Nebraska church exploded in 1950, no one was injured because every member of the choir was late arriving for practice that evening. As unbelievable as this story is, it did happen. Despite the explosion's taking place five minutes after choir practice was scheduled to begin, not one of the fifteen people who should have been present had yet arrived when the building collapsed....
Read more:
http://www.snopes.com/luck/choir.asp
http://www.guardianangel.in/ga/127-GuardianStory--This-is-an-act-of-God-.html
On a similar note:
The first segment of the following episode is about a house in Georgia that was completely spared by a tornado despite the fact that it was in its path —
The UnXplained; Season 1; Episode 13
https://play.history.com/shows/the-unxplained/season-1/episode-13
In my opinion, this event can best be ‘explained’ by the protection given by God’s angels.