Pressure was mounting on the Trump administration Wednesday to release people from immigration detention facilities where at least one detainee has tested positive for COVID-19 and advocates fear tight quarters and overall conditions could cause rapid spread of the virus.

The U.S. holds around 37,000 people in immigration detention. Detainees and advocates say many are vulnerable because of age and pre-existing medical conditions, and because they are often held in open rooms, beds 3-feet apart, and without adequate supplies of masks or other protections.

“It’s impossible to stay calm,” said Marco Battistotti, an Italian who is among 170 people detained by U.S. Immigration and Customs Enforcement at the Bristol County jail in Massachusetts. “People are panicking. People are in fear.”

The 54-year-old Battistotti was among about 100 detainees at the county jail near Cape Cod who signed a letter released by a local immigration lawyer detailing conditions inside. They asked to be released to await decisions on their immigration cases.

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“I don’t want to die in an ICE jail,” he said in a phone interview with The Associated Press. “Why can’t I fight my case on the outside?”

The agency, which reported the positive test of a 31-year-old man from Mexico held in Bergen County, New Jersey, on Tuesday, has announced steps to protect detained migrants and staff from the virus, but hasn’t said whether it plans to review cases for possible release because of the outbreak.

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