Dozens of protesters have surrounded a bus believed to be filled with immigrants slated for deportation at the U.S. Citizenship and Immigration Services office in San Francisco, a protest organizer said.

The protesters include dozens of undocumented immigrants and immigrants’ rights advocates who are rallying for the expansion of a national movement to pressure President Barack Obama to halt immigrant deportations, according to Jon Rodney, a spokesman for the California Immigrant Policy Center.

The protesters are blocking what is believed to be a bus carrying immigrants to be deported from the USCIS office at 630 Sansome St., Rodney said.

The protest was blocking traffic at the intersection of Sansome and Washington streets, he said.

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