The Homeland Security Department's internal watchdog says rotting food, moldy and dilapidated bathrooms and agency practices at immigration detention facilities may violate detainees' rights.
The Office of Inspector General made unannounced visits to four facilities in California, Louisiana, Colorado and New Jersey between May and November of last year, according to a report published Thursday.
The facilities together house about 5,000 detainees.
In an Adelanto, California detention facility, inspectors found nooses in detainee cells, the segregation of certain detainees in an overly restrictive way and inadequate medical care, the report said.
It comes as the Trump administration is managing a worsening problem at the US-Mexico border, with a dramatic increase in the number of Central American migrants. While most are families who cannot be easily returned to their home countries, the number of single adults is also on the rise.
Immigration officials are detaining an increasing number of single adults about 52,000 now but are funded for only 45,000. The administration has asked for USD4.5 billion more for additional bed space.
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Last month, Border Patrol agents made 132,887 apprehensions, topping 100,000 for the first time since April 2007 and setting a record with 84,542 adults and children apprehended. An additional 11,507 were children travelling alone, and 36,838 were single adults.
US Immigration and Customs Enforcement officials said they are working to ensure all facilities comply with standards.
They say they have already trained food service staff on food safety and they extensively cleaned and renovated housing units. They included photos of cleaned showers and bathrooms in their response.
"The safety, rights and health of detainees in ICE's care are paramount," the agency's chief financial officer, Stephen Roncone, wrote to the inspector general's office. "ICE has made substantial progress to address the findings and recommendation in the OIG's draft report."