Providence fire department investigator Paul Doughty says that the stationary load was within the caribiner’s rating but they are looking into other dynamic forces.

For more details about the accident that caused eight circus performers to plummet to the floor in front of an audience, see:

http://articles.chicagotribune.com/2014-05-05/news/chi-acrobats-injured-rhode-island-20140504_1_acrobats-critical-condition-performers