An elephant stomped and killed its trainer on Friday at a circus in Pennsylvania, CNN sad.
Andrew Anderton, 48, died after being stomped on at the Irem Shrine in Wilkes-Barre, the Associated Press said.
The elephant had touched an electrical wire, but the cause of why the elephant was startled is still unclear, CNN said.
The incident is now under investigation by the federal Occupational Safety and Health Administration, the Associated Press said.
"In the 30 years I've been doing my vending, I've never heard an animal killing their trainer and all," Ed Conrad, a ballon vendor at the circus, told a CNN affiliate. "So something must have happened."
The circus workers observed a moment of silence for the trainer and the show went on.