US Republican presidential candidate Donald Trump has been hustled off stage by security agents at a rally in Reno, Nevada, after a perceived threat in the crowd.
The incident began when Mr Trump noticed what he considered a heckler, saying it was someone “from the Hillary Clinton campaign”.
A few seconds later people near the stage began pointing at someone in the crowd near the front.
Two security agents grabbed Mr Trump by the shoulders and rushed him backstage.
The threat was unclear, but police officers swarmed over a white male in the front of the crowd and held him face down on the ground while they searched him.
Moments later, the man was escorted away by police with his hands behind his back.
A CNN reporter at the event who spoke to witnesses to the incident said no one saw a weapon.
Mr Trump released a statement thanking the Secret Service for their assistance.
“I would like to thank the United States Secret Service and the law enforcement resources in Reno and the state of Nevada for their fast and professional response,” he said.
“I also want to thank the many thousands of people present for their unwavering and unbelievable support.
“Nothing will stop us —we will make America great again!”
Mr Trump returned to the stage a short while later to continue his rally speech at the Reno convention centre, which drew thousands of supporters.
“Nobody said it was going to be easy for us. But we will never be stopped. Never ever be stopped,” Mr Trump said.