BERKELEY, CA — Police say 20 people were arrested as pro and anti-Trump demonstrators clashed in Berkeley Saturday. Two simultaneous demonstrations were planned for Civic Center Park on Saturday.

The demonstration took over Center Street and Allston Way between Milvia Street and Martin Luther King Jr. Way. The downtown Berkeley BART station was also closed as a result. Police say a large number of fights occurred and numerous fireworks were thrown in the crowds. There were also been numerous reports of pepper spray being used in the crowd. Police said at least 11 people were injured and among those at least seven were taken to hospitals.

According to police, among those arrested, the charges include arrests for assault with a deadly weapon and several other felony assaults. At least two of the arrests came from investigations into the violence that broke out in March. Demonstrators are punching each other and even using skateboards and helmets as weapons in #Berkeley. https://t.co/PAK3WUbllH pic.twitter.com/7G8hLtsA4I

— NBC Bay Area (@nbcbayarea) April 15, 2017 Photos from the scene Saturday morning showed police dressed in riot gear. In anticipation of the event, police had already informed demonstrators about a long list of items that were banned from the event, such as metal pipes, baseball bats, poles and bricks.



Police officers from Oakland came to the city's aid. Dozens of Oakland PD officers on standby to help out in Berkeley.@kron4news pic.twitter.com/Xb4ddUDl9z

— Spencer Blake (@spencerjblake) April 15, 2017 "Organizers have promoted Saturday's gathering as a follow-up to an unpermitted March 4 demonstration, when numerous people were hurt due to violence," city officials said in a statement. "Ten people were arrested for their roles in the events, and other arrests are being actively pursued. No one has applied for or obtained a permit for Saturday, and as a result, anyone at the park will be subject to these rules."



Journalists at the scene reported that police had deployed tear gas to break up scuffles.

A small blast, tear gas, a charge, and a small scuffle broken up by police at Berkeley. People coughing, tearing up pic.twitter.com/sX9bWIH251

— Alan Yuhas (@AlanYuhas) April 15, 2017 A video from the scene showed a protester being detained.