Supporters of Donald Trump and protesters clashed outside the venue in Phoenix. Arizona, where the president held a political rally on August 22.
Video here shows three people in the back of a pickup truck that is followed by several others. The truck reverses slightly, dispersing the group, before driving away.
The truck is then seen stopped in the street as police stand between its occupants and what appear to be anti-Trump protesters.
Four people were arrested during protests outside the Phoenix Convention Centre, with police using tear gas and pepper spray to disperse the crowd. Credit: Twitter/Edward James Hernandez via Storyful