Donald Trump rushed off stage during Reno, Nev., rally

U.S. Republican presidential nominee Donald Trump was hustled off the stage by security agents at a campaign event in Reno on Saturday after a perceived threat in the crowd.

Two security agents grabbed Trump by the shoulders and rushed him back stage. The threat was initially unclear, but a man near the front of the crowd was pounced on by other security agents.

The Secret Service confirmed that someone had shouted "gun" in the crowd.

"Immediately in front of the stage, an unidentified individual shouted 'gun.' Secret Service agents and Reno Police Officers immediately apprehended the subject. Upon a thorough search of the subject and the surrounding area, no weapon was found," the Secret Service said in a statement.

"A thorough investigation is ongoing at this time by the U.S. Secret Service and the Reno Police Department," it said.

TV video showed the man being escorted away by a group of police officers, with his hands behind his back.

Trump returned to the stage a few minutes later to continue his rally speech, three days before Tuesday's election.

"Nobody said it was going to be easy for us. But we will never be stopped. Never ever be stopped," Trump said.