SAN FRANCISCO—A Labor Day protest in support of the Black Lives Matter movement and workers’ rights closed lanes of the Golden Gate Bridge on Monday, September 7.

The march called “?” was planned to be carried out on the Golden Gate Bridge from 10 a.m. on Labor Day by the Black Lives Matter organization “Resistance SF.”  California Highway Patrol occasionally blocked the bridge during the march.

The protest was halted soon after it started, after police officers did not allow them to walk along the bridge. Protesters applied for a permit, the San Francisco Chronicle reported. Bridge Public Affairs spokesperson told SFGate that “officials were aware of the planned event and confirmed that traffic issues were lingering into the afternoon.”

The California Highway Patrol reported that protesters jumped into traffic, so they shut down the right lane in both directions on Highway 101 around noon, which caused a 30-minute delay for traffic. The lane closure continued until around 3 p.m.

A witness tweeted and reported that a protest was happening on the bridge and CHP was “putting on body armor and getting out beanbag guns.”

Another witness posted a video on Twitter, showing police in armored gear watching the protesters with their fists raised along the bridge.