UPDATE, 9:35 p.m. EDT: The Trump campaign denied reports that the Republican front-runner's campaign manager, Corey Lewandowski, yanked a protester by the collar at the rally in Tucson, Arizona, Saturday.

In a statement, the campaign said Lewandowski was talking to the protester "when the individual he was speaking with was pulled from behind by the man to Lewandowski’s left.”

“Mr Trump does not condone violence at his rallies, which are private events paid for by the campaign,” the statement said. Lewandowski was recently accused by Michelle Fields, a reporter at the time for Breitbart News, of grabbing her arm and leaving bruises during a campaign event. She quit the news outlet over its response to the controversy. 

UPDATE 8:10 p.m. EDT: At a rally Saturday for Republican front runner Donald Trump in Tucson, Arizona, someone reportedly kicked and punched a protester in the crowd. The protester, wearing an American flag shirt and holding a sign with a picture of Trump that said "Bad for America," was kicked several times before police moved in, NBC reported.

Trump saw the disturbance and said, "That's a disgrace," NBC reported.

Original story: Protesters against Republican presidential front-runner Saturday blocked off a main road leading to a Trump rally in Arizona, prompting arguments between protesters and the people stuck behind the blockade in their cars.

Puente Arizona, an immigrant rights group, said via Twitter Saturday it had shut down a section of Shea Boulevard in Arizona near Eagle Mountain Street. Trucks could be seen blocking off the multiple-lane road, draped with banners reading “Dump Trump” and “Shut Down Trump.”

A long line of cars could be seen stuck behind the trucks, with more protesters standing in the road with signs against Trump, who has multiple events in Arizona Saturday, including in Phoenix and Tucson. Some stuck in their cars eventually got out and started to argue with protesters, yelling at them to get off the road.

Trucks eventually began being towed from the scene. Some of the protesters told a reporter there that getting the trucks towed was part of the plan.

Other protesters began locking themselves to their cars with what appeared to be bicycle locks. Protesters also began blocking lanes of another road nearby.

Tensions ran high when a Jeep appeared to start running into the protesters blocking the road, but no injuries were reported. Immigration activists have protested Trump largely based on his remarks about race and building a border wall between the U.S. and Mexico.

"We're coming together to stand up against the hate and the violence that Donald Trump is inciting towards our people," Carlos Garcia, director of Puente Arizona, said to NBC News this week about the protest.

Trump protesters were also scheduled to peacefully protest outside a scheduled Trump rally in Fountain Hills Park in Arizona on Saturday. "Protesters will be rallying nearby the event to be a visible voice against Trump's rhetoric of racism that is fostering a dangerous and dehumanizing climate in Arizona and across the country," organizers of the protest said in a statement. 

Protests have formed in areas where Trump has been holding campaign events recently, and in some cases outright violence has sprung up. A Trump rally in Chicago last week had to be canceled after clashes erupted between pro- and anti-Trump factions.