A U.S. Senate investigation has uncovered dozens of credible reports of medical neglect and poor conditions in immigration detention centers nationwide — with detainees denied insulin, left without medical attention for days and forced to compete for clean water — raising scrutiny about how the government oversees its vast detention system.

The report released by Sen. Jon Ossoff , a Democrat from Georgia, is the second in a series of inquiries examining alleged human rights abuses in the immigration detention system . It builds on an August review that detailed mistreatment of children and pregnant women and draws from more than 500 reports of abuse and neglect collected between January and August.

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