Republican candidate Donald Trump was briefly rushed off the stage by Secret Service agents at a rally in Reno, Nevada in a false alarm.
A man holding a sign saying Republicans Against Trump was tackled by security agents, after claims that he had a gun.
Mr Trump returned to the stage minutes later.
When he resumed his speech, Mr Trump said: “Nobody said it was going to be easy for us… I want to thank the Secret Service.”
The Secret Service later confirmed that someone in front of the stage had shouted “gun”, but that “upon a thorough search of the subject and the surrounding area, no weapon was found”.