Thousands of supporters and protesters descended on downtown San Diego on Friday for presumptive GOP nominee Donald Trump's rally.
Twitter buzzed around the hashtag #SDTrumpRally and thousands were sharing photos and videos of the heavy police presence in addition to the crowds.
Tweets captured the strong contingent of San Diego police officers watching over the crowd outside the San Diego Convention Center.
Countless media personnel congregated outside the convention center. As Trump arrived at the convention center and spoke before thousands of supporters, tensions outside mounted.
Video footage shared on Twitter showed protesters clashing with police, and by 3:30 p.m., one protester had been arrested.
Here's how the afternoon is unfolding on Twitter.
