SAN DIEGO (Border Report) -- About 200 immigrants who thought they were showing up for annual check-in procedures with Immigration and Customs Enforcement in San Diego have been detained and are being kept in the basement of the federal courthouse in downtown.

Attorneys for some of the migrants say their clients showed up to court after receiving letters from ICE asking them to appear for "an official matter."

They also tell Border Report that ICE has been using this tactic to arrest people for weeks, and then hold them in the building's basement because there's no room at the Otay Mesa Detention Center.

Some of the detained migrants have been reportedly deported to Mexico.

According to one lawyer, who wanted to remain anonymous, her clients were kept in rooms that were "freezing" and

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