Large crowds protested the presumptive Republican presidential nominee's appearance in downtown Denver on Friday. Here's what we saw.

The altercation between a Trump supporter and protester started when the two began shouting at each other in a tightly packed crowd. As the fight turned physical, police stepped in and took three men — two protesters and a supporter — into custody.

One of the protesters, Jose Silva, later told BuzzFeed News he was released without citation. The two other men did not appear again at the event and Denver Police did not immediately say if the individuals had been cited or jailed.

"You can't come into our city and bring that kind of hate without being held accountable," Silva said of his involvement in the anti-Trump protest.

Another protester, Josie Valadez Fraire, was taken into custody while she was holding a smoldering bundle of sage. Fraire was later released and told BuzzFeed News she had been cited.