Republican presidential candidate Donald Trump is rushed to safety when a man rushes the stage while he was speaking in Reno, Nevada.

Republican Donald Trump was rushed off stage by security agents at a rally in Reno, Nevada, on Saturday night after a false alarm as someone in the crowd shouted "gun" during scuffles with a man who held up a "Republicans against Trump" sign.

The incident occurred as Trump and Democratic rival Hillary Clinton crisscrossed the United States a late push to win over undecided voters and make sure supporters turn out enthusiastically on Election Day.

Two security agents seized Trump by the shoulders and hustled him backstage as police officers swarmed over a man in the front of the crowd and held him down and searched him before escorting him away with his hands behind his back.

A security official grabs Donald Trump mid-speech.

Trump, seemingly unruffled, returned to the stage and continued his speech after a short time, saying "Nobody said it was going to be easy for us" and adding "We will never be stopped."

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After being released, the man who was apprehended told CBS News Reno affiliate KTVN-2 that he was a Republican supporter who attended the rally to express his opposition to Trump.

CNN/TWITTER Trump is whisked away.

"I came here with this sign expecting boos ... But it was just a sign," Austyn Crites said.

Crites said when he took it out, the crowd began to attack him, choking and beating him before "someone yelled about a gun."

After being held for a few hours' questioning and security and background checks, Crites said he was released, and that the police "did their job."

KTVN-2 Austyn Crites' weapon of choice was a homemade "Republicans against Trump" sign.

Crites said he wanted to contrast President Barack Obama's reaction to a protester during a rally a few days ago, in which he urged the crowd to respect the protester, with Trump's, saying he wanted "people to understand" the difference.

"I have nothing against Trump supporters," Crites told the station. "We are all registered Republicans and support many of the same candidates for local offices. I have serious concern against Trump," he added.

The Secret Service confirmed that the incident erupted when an unidentified individual in front of the stage 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.

The incident began when Trump noticed what he considered a heckler.

"Oh we have one of those guys from the Hillary Clinton campaign," he said.

CARLO ALLEGRI/REUTERS Secret Security apparently spotted a "perceived threat".

"How much are you being paid, $1500? Alright. Take him out."

Seconds later people near the stage began pointing at someone in the crowd near the front, and agents took Trump away.

In a statement, Trump thanked the Secret Service, Reno and Nevada law enforcement for "their fast and professional response."

CARLO ALLEGRI/REUTERS A police officer stands guard backstage where Trump was hustled off to.

Some Trump supporters accused Crites of being a Clinton plant.

However, media reported he had been a registered Republican since 2011.​