Video shows Trump looking into the crowd right before officers grabbed the candidate and pulled him behind the stage.
Multiple reports say the incident was triggered by a man named Austyn Crites, who was holding a "Republicans Against Trump" sign. But Crites says crowd members swarmed him and began beating him.
Trump rushed off stage
Trump rushed off stage
Police officers stand guard backstage after U.S. Republican presidential nominee Donald Trump was hustled off the stage by security agents at a campaign event following a perceived threat in the crowd, in Reno, Nevada, U.S. November 5, 2016. Trump returned to the stage a few minutes later to continue his rally speech. REUTERS/Carlo Allegri
Security personnel rush off stage after Republican presidential nominee Donald Trump was escorted away during a rally at the Reno-Sparks Convention Center in Reno, Nevada on November 5, 2016. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Republican presidential nominee Donald Trump (centre L) addresses supporters during a campaign rally at the National Western Complex in Denver, Colorado on November 5, 2016.
White House Republican candidate Donald Trump was earlier in the day bundled off stage by security officers on November 5 after a false gun scare during a campaign appearance.
/ AFP / Jason Connolly (Photo credit should read JASON CONNOLLY/AFP/Getty Images)
Republican presidential nominee Donald Trump is hustled off the stage by security agents following a perceived threat in the crowd at a campaign rally in Reno, Nevada, U.S. November 5, 2016. Trump returned to the stage a few minutes later to continue his rally speech. REUTERS/Carlo Allegri TPX IMAGES OF THE DAY
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"People started going crazy. These people couldn't grab the sign; they start tackling me," Crites said.
A Secret Service spokesperson told reporters at some point during the incident, an unidentified individual shouted "gun" in front of the stage, which triggered the rush of authorities into the crowd.
No gun was found after a "thorough search." Secret Service members detained Crites and led him out of the rally.
Trump came back on stage after a few minutes to continue his speech and thanked the Secret Service members.
"Nobody said it was going to be easy for us, but we will never be stopped," Trump said.