Civil rights advocates argued in federal court on Monday that immigrants are being detained in unacceptable conditions in the U.S. Immigration and Customs Enforcement field office in downtown San Francisco.

Asylum seekers and others detained while showing up for their immigration court date have been kept for days at a time in rooms meant to hold people for less than 12 hours, according to advocates.

The Lawyers’ Committee for Civil Rights of the San Francisco Bay Area — one of the groups that has sued the federal government — says that this practice violates both federal law and the Constitution and it is asking the court to provide immediate relief to detained immigrants.

The lawsuit alleges that ICE has kept immigrants detained at the 630 Sansome St. holding site in “a state of s

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