OAKLAND (CBS SF) — A protester taking part in a demonstration was hit by a car and seriously injured on eastbound state Highway 24 in Oakland Wednesday morning, CHP officers said.

The incident happened after several dozen protesters started marching in Oakland following the election of Republican candidate Donald Trump as the next president.

READ MORE: Biden To Restore California's Power To Set Auto Emission Rules, Reverse Trump Decision

The 12th Street Oakland City Center BART station has closed because the protest, BART officials reported at 12:18 a.m.

About 50 protesters are in the area of state Highway 24, according to Oakland police. There were some reports of protesters blocking traffic and throwing objects at passing vehicles.

The protester was hit near the Claremont Avenue off-ramp and is being treated for serious injuries, according to the CHP.

READ MORE: Early Draft Of BART Budget Forecasts Ridership Increase, Federal Funding Needs

The 12th Street Oakland City Center BART station closed because of the protest, BART officials reported at 12:18 a.m.

There were additional reports of fires being started along Broadway in Oakland as well as windows of businesses being smashed.

The protest started downtown, in the area of 14th Street and Broadway, police said.

Police are calling on all available officers to set up in different parts of the area. Officers are in riot gear, including helmets, gas masks and long batons, police said.

MORE NEWS: UPDATE: Early Morning Looting Caravan Targets Stores In Emeryville, Oakland; One Suspect Arrested

TM and © Copyright 2016 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2016 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. Bay City News Service contributed to this report.