The cause of the turbulence is under investigation. Singapore Airlines said the Singapore-bound flight from London encountered severe turbulence about 10 hours after departure.

Death by turbulence rarely occurs, but severe encounters are not uncommon, according to Larry Cornman, a physicist and project scientist with the U.S. National Science Foundation National Center for Atmospheric Research.

“Often, for something like this, it’s just wrong place, wrong time,” said Cornman, who studies…